INFORMATION is that which informs. In other words, it is the answer to a question of some kind. It is thus related to data and knowledge , as data represents values attributed to parameters, and knowledge signifies understanding of real things or abstract concepts. As it regards data, the information's existence is not necessarily coupled to an observer (it exists beyond an event horizon , for example), while in the case of knowledge, the information requires a cognitive observer .
At its most fundamental level, information is any propagation of cause and effect within a system. Information is conveyed either as the content of a message or through direct or indirect observation of anything.That which is perceived can be construed as a message in its own right, and in that sense, information is always conveyed as the content of a message .
Information can be encoded into various forms for transmission and interpretation (for example, information may be encoded into a sequence of signs , or transmitted via a sequence of signals ). It can also be encrypted for safe storage and communication.
Information reduces uncertainty . The uncertainty of an event is measured by its probability of occurrence and is inversely proportional to that. The more uncertain an event, the more information is required to resolve uncertainty of that event. The bit is a typical unit of information , but other units such as the nat may be used. For example, the information encoded in one "fair" coin flip is log2(2/1) = 1 bit, and in two fair coin flips is log2(4/1) = 2 bits.
The concept that _information is the message_ has different meanings in different contexts. Thus the concept of information becomes closely related to notions of constraint , communication , control , data , form , education , knowledge , meaning , understanding , mental stimuli , pattern , perception , representation , and entropy .
* 1 Etymology * 2 Information theory approach * 3 As sensory input * 4 As representation and complexity * 5 As an influence which leads to a transformation * 6 As a property in physics * 7 The application of information study * 8 Technologically mediated information * 9 As records * 10 Semiotics * 11 See also * 12 References * 13 Further reading * 14 External links
See also: History of the word and concept "information"
The English word was apparently derived from the Latin stem (_information-_) of the nominative (_informatio_): this noun is derived from the verb _informare_ (to inform) in the sense of "to give form to the mind", "to discipline", "instruct", "teach". _Inform_ itself comes (via French _informer_) from the Latin verb _informare_, which means to give form, or to form an idea of. Furthermore, Latin itself already contained the word _informatio_ meaning concept or idea, but the extent to which this may have influenced the development of the word _information_ in English is not clear.
The ancient Greek word for _form_ was μορφή (_morphe_; cf. morph) and also εἶδος (_eidos_) "kind, idea, shape, set", the latter word was famously used in a technical philosophical sense by Plato (and later Aristotle ) to denote the ideal identity or essence of something (see Theory of Forms ). "Eidos" can also be associated with thought, proposition , or even concept.
The ancient Greek word for _information_ is πληροφορία, which transliterates (_plērophoria_) from πλήρης (_plērēs_) "fully" and φέρω (_phorein_) frequentative of (_pherein_) to carry-through. It literally means "fully bears" or "conveys fully". In modern Greek language the word Πληροφορία is still in daily use and has the same meaning as the word _information_ in English. In addition to its primary meaning, the word Πληροφορία as a symbol has deep roots in Aristotle's semiotic triangle . In this regard it can be interpreted to communicate information to the one decoding that specific type of sign . This is something that occurs frequently with the etymology of many words in ancient and modern Greek language where there is a very strong denotative relationship between the signifier, e.g. the word symbol that conveys a specific encoded interpretation, and the signified, e.g. a concept whose meaning the interpreter attempts to decode.
INFORMATION THEORY APPROACH
Main article: Information theory
From the stance of information theory , _information_ is taken as an ordered sequence of symbols from an alphabet, say an input alphabet χ, and an output alphabet ϒ. Information processing consists of an input-output function that maps any input sequence from χ into an output sequence from ϒ. The mapping may be probabilistic or deterministic. It may have memory or be memoryless.
AS SENSORY INPUT
Often information can be viewed as a type of input to an organism or system . Inputs are of two kinds; some inputs are important to the function of the organism (for example, food) or system (energy ) by themselves. In his book _Sensory Ecology_ Dusenbery called these causal inputs. Other inputs (information) are important only because they are associated with causal inputs and can be used to predict the occurrence of a causal input at a later time (and perhaps another place). Some information is important because of association with other information but eventually there must be a connection to a causal input. In practice, information is usually carried by weak stimuli that must be detected by specialized sensory systems and amplified by energy inputs before they can be functional to the organism or system. For example, light is mainly (but not only, e.g. plants can grow in the direction of the lightsource) a causal input to plants but for animals it only provides information. The colored light reflected from a flower is too weak to do much photosynthetic work but the visual system of the bee detects it and the bee's nervous system uses the information to guide the bee to the flower, where the bee often finds nectar or pollen, which are causal inputs, serving a nutritional function.
AS REPRESENTATION AND COMPLEXITY
The cognitive scientist and applied mathematician Ronaldo Vigo argues that information is a concept that involves at least two related entities in order to make quantitative sense. These are, any dimensionally defined category of objects S, and any of its subsets R. R, in essence, is a representation of S, or, in other words, conveys representational (and hence, conceptual) information about S. Vigo then defines the amount of information that R conveys about S as the rate of change in the complexity of S whenever the objects in R are removed from S. Under "Vigo information", pattern, invariance, complexity, representation, and information—five fundamental constructs of universal science—are unified under a novel mathematical framework. Among other things, the framework aims to overcome the limitations of Shannon-Weaver information when attempting to characterize and measure subjective information.
AS AN INFLUENCE WHICH LEADS TO A TRANSFORMATION
Information is any type of pattern that influences the formation or transformation of other patterns. In this sense, there is no need for a conscious mind to perceive, much less appreciate, the pattern. Consider, for example, DNA . The sequence of nucleotides is a pattern that influences the formation and development of an organism without any need for a conscious mind. One might argue though that for a human to consciously define a pattern, for example a nucleotide, naturally involves conscious information processing.
Systems theory at times seems to refer to information in this sense, assuming information does not necessarily involve any conscious mind, and patterns circulating (due to feedback ) in the system can be called information. In other words, it can be said that information in this sense is something potentially perceived as representation, though not created or presented for that purpose. For example, Gregory Bateson defines "information" as a "difference that makes a difference".
If, however, the premise of "influence" implies that information has been perceived by a conscious mind and also interpreted by it, the specific context associated with this interpretation may cause the transformation of the information into knowledge . Complex definitions of both "information" and "knowledge" make such semantic and logical analysis difficult, but the condition of "transformation" is an important point in the study of information as it relates to knowledge, especially in the business discipline of knowledge management . In this practice, tools and processes are used to assist a knowledge worker in performing research and making decisions, including steps such as:
* reviewing information in order to effectively derive value and meaning * referencing metadata if any is available * establishing a relevant context , often selecting from many possible contexts * deriving new knowledge from the information * making decisions or recommendations from the resulting knowledge.
Stewart (2001) argues that the transformation of information into knowledge is a critical one, lying at the core of value creation and competitive advantage for the modern enterprise.
The Danish Dictionary of Information Terms argues that information only provides an answer to a posed question. Whether the answer provides knowledge depends on the informed person. So a generalized definition of the concept should be: "Information" = An answer to a specific question".
When Marshall McLuhan speaks of media and their effects on human cultures, he refers to the structure of artifacts that in turn shape our behaviors and mindsets. Also, pheromones are often said to be "information" in this sense.
AS A PROPERTY IN PHYSICS
Main article: Physical information
Information has a well-defined meaning in physics. In 2003 J. D. Bekenstein claimed that a growing trend in physics was to define the physical world as being made up of information itself (and thus information is defined in this way) (see Digital physics ). Examples of this include the phenomenon of quantum entanglement , where particles can interact without reference to their separation or the speed of light. Material information itself cannot travel faster than light even if that information is transmitted indirectly. This could lead to all attempts at physically observing a particle with an "entangled" relationship to another being slowed down, even though the particles are not connected in any other way other than by the information they carry.
The mathematical universe hypothesis suggests a new paradigm, in which virtually everything, from particles and fields, through biological entities and consciousness, to the multiverse itself, could be described by mathematical patterns of information. By the same token, the cosmic void can be conceived of as the absence of material information in space (setting aside the virtual particles that pop in and out of existence due to quantum fluctuations, as well as the gravitational field and the dark energy). Nothingness can be understood then as that within which no matter, energy, space, time, or any other type of information could exist, which would be possible if symmetry and structure break within the manifold of the multiverse (i.e. the manifold would have tears or holes).
Another link is demonstrated by the Maxwell\'s demon thought experiment. In this experiment, a direct relationship between information and another physical property, entropy , is demonstrated. A consequence is that it is impossible to destroy information without increasing the entropy of a system; in practical terms this often means generating heat. Another more philosophical outcome is that information could be thought of as interchangeable with energy . Toyabe et al. experimentally showed in nature that information can be converted into work. Thus, in the study of logic gates , the theoretical lower bound of thermal energy released by an _AND gate_ is higher than for the _NOT gate_ (because information is destroyed in an _AND gate_ and simply converted in a _NOT gate_). Physical information is of particular importance in the theory of quantum computers .
In thermodynamics , information is any kind of event that affects the state of a dynamic system that can interpret the information.
THE APPLICATION OF INFORMATION STUDY
The information cycle (addressed as a whole or in its distinct components) is of great concern to Information Technology , Information Systems , as well as Information Science . These fields deal with those processes and techniques pertaining to information capture (through sensors ) and generation (through computation , formulation or composition), processing (including encoding, encryption, compression, packaging), transmission (including all telecommunication methods), presentation (including visualization / display methods), storage (such as magnetic or optical, including holographic methods ), etc. Information does not cease to exist, it may only get scrambled beyond any possibility of retrieval (within Information Theory , see lossy compression ; in Physics , the black hole information paradox gets solved with the aid of the holographic principle ).
Information Visualization (shortened as InfoVis) depends on the computation and digital representation of data, and assists users in pattern recognition and anomaly detection.
Partial map of the Internet, with nodes representing IP addresses *
Galactic (including dark) matter distribution in a cubic section of the Universe *
Information embedded in an abstract mathematical object with symmetry breaking nucleus *
Visual representation of a strange attractor, with converted data of its fractal structure
Information Security (shortened as InfoSec) is the ongoing process of exercising due diligence to protect information, and information systems, from unauthorized access, use, disclosure, destruction, modification, disruption or distribution, through algorithms and procedures focused on monitoring and detection, as well as incident response and repair.
Information Analysis is the process of inspecting, transforming, and modelling information, by converting raw data into actionable knowledge, in support of the decision-making process.
Information Quality (shortened as InfoQ) is the potential of a dataset to achieve a specific (scientific or practical) goal using a given empirical analysis method.
Records may be maintained to retain corporate memory of the organization or to meet legal, fiscal or accountability requirements imposed on the organization. Willis expressed the view that sound management of business records and information delivered "...six key requirements for good corporate governance ...transparency; accountability; due process; compliance; meeting statutory and common law requirements; and security of personal and corporate information."
Michael Buckland has classified "information" in terms of its uses: "information as process", "information as knowledge", and "information as thing".
Beynon-Davies explains the multi-faceted concept of information in terms of signs and signal-sign systems. Signs themselves can be considered in terms of four inter-dependent levels, layers or branches of semiotics : pragmatics, semantics, syntax, and empirics. These four layers serve to connect the social world on the one hand with the physical or technical world on the other.
Pragmatics is concerned with the purpose of communication. Pragmatics links the issue of signs with the context within which signs are used. The focus of pragmatics is on the intentions of living agents underlying communicative behaviour. In other words, pragmatics link language to action.
Semantics is concerned with the meaning of a message conveyed in a communicative act. Semantics considers the content of communication. Semantics is the study of the meaning of signs - the association between signs and behaviour. Semantics can be considered as the study of the link between symbols and their referents or concepts – particularly the way in which signs relate to human behavior.
Syntax is concerned with the formalism used to represent a message. Syntax as an area studies the form of communication in terms of the logic and grammar of sign systems. Syntax is devoted to the study of the form rather than the content of signs and sign-systems.
Nielsen (2008) discusses the relationship between semiotics and information in relation to dictionaries. The concept of lexicographic information costs is introduced and refers to the efforts users of dictionaries need to make in order to, first, find the data sought and, secondly, understand the data so that they can generate information.
Communication normally exists within the context of some social situation. The social situation sets the context for the intentions conveyed (pragmatics) and the form in which communication takes place. In a communicative situation intentions are expressed through messages which comprise collections of inter-related signs taken from a language which is mutually understood by the agents involved in the communication. Mutual understanding implies that agents involved understand the chosen language in terms of its agreed syntax (syntactics) and semantics. The sender codes the message in the language and sends the message as signals along some communication channel (empirics). The chosen communication channel will have inherent properties which determine outcomes such as the speed with which communication can take place and over what distance.
* Abstraction * Accuracy and precision * Anti-information reduces certainty * Classified information * Complex adaptive system * Complex system * Cybernetics * Data storage device#Recording medium * Exformation * Free Information Infrastructure * Freedom of information * Information and communication technologies * Information architecture * Information broker * Information continuum * Informatics * Information geometry * Information inequity * Information infrastructure * Information management * Information mapping * Information overload * Information processor * Information sensitivity * Information superhighway * Information Quality (InfoQ) * Information warfare * Infosphere * Lexicographic information cost * Library science * Philosophy of information * Propaganda model * Quantum information * Receiver operating characteristic * Satisficing
* ^ " Information Definition of Information by Merriam-Webster". _Merriam-webster.com_. Retrieved 2017-05-01. * ^ "epistemology - Can there be information without a "knower"?". Philosophy Stack Exchange. 2017-01-05. Retrieved 2017-05-01. * ^ * ^ A short overview is found in: Luciano Floridi (2010). _ Information - A Very Short Introduction_. Oxford University Press. ISBN 0-19-160954-4 . The goal of this volume is to provide an outline of what information is... * ^ Stephen B. Wicker, Saejoon Kim (2003). _Fundamentals of Codes, Graphs, and Iterative Decoding_. Springer. pp. 1 _ff_. ISBN 1-4020-7264-3 . * ^ Dusenbery, David B. (1992). _Sensory Ecology_. W.H. Freeman., New York. ISBN 0-7167-2333-6 . * ^ Vigo, R. (2011). "Representational information: a new general notion and measure of information". _ Information Sciences_. 181: 4847–4859. doi :10.1016/j.ins.2011.05.020 . * ^ Vigo, R (2013). " Complexity over Uncertainty in Generalized Representational Information Theory (GRIT): A Structure-Sensitive General Theory of Information". _Information_. 4 (1): 1–30. doi :10.3390/info4010001 . * ^ Vigo, R. (2014). Mathematical Principles of Human Conceptual Behavior: The Structural Nature of Conceptual Representation and Processing. Scientific Psychology Series, Routledge, New York and London; ISBN 0415714362 . * ^ Shannon, Claude E. (1949). _The Mathematical Theory of Communication_. * ^ Casagrande, David (1999). " Information as verb: Re-conceptualizing information for cognitive and ecological models" (PDF). _Journal of Ecological Anthropology_. 3 (1): 4–13. doi :10.5038/2162-4522.214.171.124 . * ^ Bateson, Gregory (1972). _^ Form, Substance, and Difference, in Steps to an Ecology of Mind_. University of Chicago Press. pp. 448–466. * ^ Bo Krantz Simonsen, www.progresso.dk. "Informationsordbogen - vis begreb". _Informationsordbogen.dk_. Retrieved 2017-05-01. * ^ Zeeya Merali. "Demonic device converts information to energy : Nature News". _Nature.com_. Retrieved 2017-05-01. * ^ _A_ _B_ "The World’s Technological Capacity to Store, Communicate, and Compute Information", Martin Hilbert and Priscila López (2011), Science (journal) , 332(6025), 60-65; free access to the article through here: martinhilbert.net/WorldInfoCapacity.html * ^ _A_ _B_ "World_info_capacity_animation". YouTube . 2011-06-11. Retrieved 2017-05-01. * ^ _ISO 15489_ * ^ Willis 2005 . * ^ Buckland, Michael K. (June 1991). " Information as thing". _Journal of the American Society for Information Science _. 42 (5): 351–360. doi :10.1002/(SICI)1097-4571(199106)42:53.0.CO;2-3 . * ^ Beynon-Davies P. (2002). Information Systems: an introduction to informatics in Organisations. Palgrave, Basingstoke, UK. ISBN 0-333-96390-3 * ^ Beynon-Davies P. (2009). Business Information Systems. Palgrave, Basingstoke. ISBN 978-0-230-20368-6
* Alan Liu (2004). The Laws of Cool: Knowledge Work and the Culture of Information, University of Chicago Press * Bekenstein, Jacob D. (2003, August). Information in the holographic universe . _Scientific American_. * Gleick, James (2011). The Information: A History, a Theory, a Flood . Pantheon, New York, NY. * Shu-Kun Lin (2008). 'Gibbs Paradox and the Concepts of Information, Symmetry, Similarity and Their Relationship', _Entropy_, 10 (1), 1-5. Available online at Entropy journal website. * Luciano Floridi , (2005). 'Is Information Meaningful Data?', _ Philosophy and Phenomenological Research_, 70 (2), pp. 351 – 370. Available online at PhilSci Archive * Luciano Floridi , (2005). 'Semantic Conceptions of Information', _The Stanford Encyclopedia of Philosophy_ (Winter 2005 Edition), Edward N. Zalta (ed.). Available online at Stanford University * Luciano Floridi , (2010). Information: A Very Short Introduction, Oxford University Press , Oxford. * Robert K. Logan . _W