# Computation

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In computer science, a **computation** is the *evolution over time of a computer*. However, the meaning of the word computer should be understood in a large sense, since it doese not restrict to a digital computer. A typical example of a **physical computation** is the evolution over time of a digital computer. Other examples of physical computations are derived from *quantum computers* or *molecular computers*. In computer science, which is sometimes described as the discipline that studies computations, mathematical models of computers are defined; a typical model is the Turing machine. In this context, a computation thus becomes a *mathematical object*: the evolution over time of a Turing machine. The sub-field of computer science which studies mathematical models of computations is called the theory of computation.

## History

The word computation has an archaic meaning (from its latin ethymologycal roots), but the word has come back in use with the arising of a new scientific discipline: computer science.