The Turing machine is a model introduced by Alan Turing which performs simple instructions for carrying out a computational task. Turing introduced that model to clarify what a mechanical process computes. We can be sure that what a Turing machine can compute is considered to be computed mechanically. The point of Turing’s argument is its converse: what can be computed mechanically can be computed by a Turing machine. Turing developed arguments to support this direction of thought.