In computer science, an instance is an occurrence of a software element that is based on a type definition. When created, an occurrence is said to have been instantiated, and both the creation process and the result of creation are called instantiation.
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Examples
Class instance An object-oriented programming (OOP) object created from a class. Each instance of a class shares a data layout but has its own memory allocation. Computer instance An occurrence of a virtual machine which typically includes storage, a virtual CPU. Polygonal model In computer graphics, it can be instantiated in order to be drawn several times in different locations in a scene which can improve the performance of rendering since a portion of the work needed to display each instance is reused. Program instance In a POSIX-oriented operating system, it refers to an executing process. It is instantiated for a program via system calls such as fork() and exec(). Each executing process is an instance of a program which it has been instantiated from.1References
Bach, Maurice J. (1986). The Design of the UNIX Operating System. Prentice Hall. pp. 10, 24. ISBN 0-13-201799-7. Archived from the original on 2010-03-15. 0-13-201799-7 ↩