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Search Engine (computing)
A search engine is an information retrieval system designed to help find information stored on a computer system. The search results are usually presented in a list and are commonly called hits. Search engines help to minimize the time required to find information and the amount of information which must be consulted, akin to other techniques for managing information overload.

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Information Retrieval
Information retrieval (IR) is the activity of obtaining information resources relevant to an information need from a collection of information resources. Searches can be based on full-text or other content-based indexing. Information retrieval is the science of searching for information in a document, searching for documents themselves, and also searching for metadata that describe data, and for databases of texts, images or sounds. Automated information retrieval systems are used to reduce what has been called information overload. An IR systems is a software that provide access to books, journals and other documents, stores them and manages the document
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Desktop Search
Desktop search tools search within a user's own computer files as opposed to searching the Internet. These tools are designed to find information on the user's PC, including web browser history, e-mail archives, text documents, sound files, images, and video. One of the main advantages of desktop search programs is that search results are displayed quickly due to the use of proper indexes. A variety of desktop search programs are now available; see this list for examples. Most desktop search programs are standalone applications, whereas a few also provide search capabilities in an integrated writing environment (IWE). Desktop search emerged as a concern for large firms for two main reasons: untapped productivity and security. On the one hand, users need to be able to quickly find relevant files, but on the other hand, they shouldn't have access to restricted files
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Exclusive Nor Gate
The XNOR gate (sometimes, EXNOR, ENOR, and, rarely, NXOR, XAND) is a digital logic gate whose function is the logical complement of the exclusive OR (XOR) gate. The two-input version implements logical equality, behaving according to the truth table to the right. A high output (1) results if both of the inputs to the gate are the same. If one but not both inputs are high (1), a low output (0) results
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Metadata
Metadata is "data [information] that provides information about other data". Three distinct types of metadata exist: descriptive metadata, structural metadata, and administrative metadata.

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Computer System
A computer is a device that can be instructed to carry out sequences of arithmetic or logical operations automatically. Modern computers have the ability to follow generalized sets of operations, called programs. These programs enable computers to perform an extremely wide range of tasks. Computers are used as control systems for a wide variety of industrial and consumer devices. This includes simple special purpose devices like microwave ovens and remote controls, factory devices such as industrial robots and computer assisted design, and also general purpose devices like personal computers and mobile devices such as smartphones. Early computers were only conceived as calculating devices. Since ancient times, simple manual devices like the abacus aided people in doing calculations. Early in the Industrial Revolution, some mechanical devices were built to automate long tedious tasks, such as guiding patterns for looms
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Computer Storage
Computer data storage, often called storage or memory, is a technology consisting of computer components and recording media that are used to retain digital data. It is a core function and fundamental component of computers. The central processing unit (CPU) of a computer is what manipulates data by performing computations. In practice, almost all computers use a storage hierarchy, which puts fast but expensive and small storage options close to the CPU and slower but larger and cheaper options farther away. Generally the fast volatile technologies (which lose data when off power) are referred to as "memory", while slower persistent technologies are referred to as "storage". In the Von Neumann architecture, the CPU consists of two main parts: The control unit and the arithmetic logic unit (ALU)
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Cache (computing)
In computing, a cache /kæʃ/ KASH, is a hardware or software component that stores data so future requests for that data can be served faster; the data stored in a cache might be the result of an earlier computation, or the duplicate of data stored elsewhere. A cache hit occurs when the requested data can be found in a cache, while a cache miss occurs when it cannot. Cache hits are served by reading data from the cache, which is faster than recomputing a result or reading from a slower data store; thus, the more requests can be served from the cache, the faster the system performs. To be cost-effective and to enable efficient use of data, caches must be relatively small
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Meta Search Engine
A metasearch engine (or aggregator) is a search tool that uses another search engine's data to produce its own results from the Internet. Metasearch engines take input from a user and simultaneously send out queries to third party search engines for results. Sufficient data is gathered, formatted by their ranks and presented to the users. Metasearch engines have their own sets of unique problems. All of the websites stored on search engines are different, which draws irrelevant content. Problems such as spamming reduces result accuracy. The process of fusion aims to tackle this issue and improve the engineering of a metasearch engine. There are many types of metasearch engines available to allow users to access specialised information in a particular field
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Logical Conjunction
In logic, mathematics and linguistics, And (∧) is the truth-functional operator of logical conjunction; the and of a set of operands is true if and only if all of its operands are true
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Metasearch Engine
A metasearch engine (or aggregator) is a search tool that uses another search engine's data to produce its own results from the Internet. Metasearch engines take input from a user and simultaneously send out queries to third party search engines for results. Sufficient data is gathered, formatted by their ranks and presented to the users. Metasearch engines have their own sets of unique problems. All of the websites stored on search engines are different, which draws irrelevant content. Problems such as spamming reduces result accuracy. The process of fusion aims to tackle this issue and improve the engineering of a metasearch engine. There are many types of metasearch engines available to allow users to access specialised information in a particular field
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Medical Literature Retrieval
Medical literature retrieval or medical document retrieval is an activity that uses professional methods for medical research papers retrieval, report and other data to improve medicine research and practice.

Enterprise Search
Enterprise search is the practice of making content from multiple enterprise-type sources, such as databases and intranets, searchable to a defined audience . "Enterprise search" is used to describe the software of search information within an enterprise (though the search function and its results may still be public). Enterprise search can be contrasted with web search, which applies search technology to documents on the open web, and desktop search, which applies search technology to the content on a single computer. Enterprise search systems index data and documents from a variety of sources such as: file systems, intranets, document management systems, e-mail, and databases
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