Virtual may refer to: *

Virtual image In optics, the ''image'' of an object is defined as the collection of Focus (optics), focus points of Ray (optics), light rays coming from the object. A ''real image'' is the collection of focus points made by Vergence (optics), converging ray ...

, an apparent image of an object (as opposed to a real object), in the study of optics *

Virtual (horse) Virtual (foaled 10 May 2005) is a thoroughbred racehorse who won the Lockinge Stakes at Newbury in 2009. Virtual is a bay horse who was sired by Pivotal out of Virtuous. He was bred and owned by Cheveley Park Stud and trained by John Gosden a ...

, a thoroughbred racehorse * Virtual channel, a channel designation which differs from that of the actual radio channel (or range of frequencies) on which the signal travels *

Virtual function In object-oriented programming such as is often used in C++ and Object Pascal, a virtual function or virtual method is an inheritable and overridable function or method that is dispatched dynamically. Virtual functions are an important part ...

, a programming function or method whose behaviour can be overridden within an inheriting class by a function with the same signature *

Virtual machine In computing, a virtual machine (VM) is the virtualization or emulator, emulation of a computer system. Virtual machines are based on computer architectures and provide the functionality of a physical computer. Their implementations may involve ...

, the virtualization of a computer system * Virtual meeting, or web conferencing *

Virtual memory In computing, virtual memory, or virtual storage, is a memory management technique that provides an "idealized abstraction of the storage resources that are actually available on a given machine" which "creates the illusion to users of a ver ...

, a memory management technique that abstracts the memory address space in a computer *

Virtual particle A virtual particle is a theoretical transient particle that exhibits some of the characteristics of an ordinary particle, while having its existence limited by the uncertainty principle, which allows the virtual particles to spontaneously emer ...

, a type of short-lived particle of indeterminate mass *

Virtual reality Virtual reality (VR) is a Simulation, simulated experience that employs 3D near-eye displays and pose tracking to give the user an immersive feel of a virtual world. Applications of virtual reality include entertainment (particularly video gam ...

(virtuality), computer programs with an interface that gives the user the impression that they are physically inside a simulated space *

Virtual world A virtual world (also called a virtual space or spaces) is a Computer simulation, computer-simulated environment which may be populated by many simultaneous users who can create a personal Avatar (computing), avatar and independently explore th ...

, a computer-based simulated environment populated by many users who can create a personal avatar, and simultaneously and independently explore the world, participate in its activities and communicate with others * ''Virtual'', a 2001 album by Romanian band Animal X * Virtual, a former Blizzard Entertainment online streamer known for interviewing Ng Wai Chung during the ''Blitzchung Controversy'' *

Exit pupil In optics, the exit pupil is a virtual aperture in an optical system. Only ray (optics), rays which pass through this virtual aperture can exit the system. The exit pupil is the image of the aperture stop in the optics that follow it. In a optic ...

, a virtual aperture in an optical system

See also