Alan Turing invented the theoretical concept of a Turing machine and helped build a number of early computers.

The Turing machine itself however is a theoretical model for a simple computer and no true Turing machine has ever been built in real life. All practical computers that have been built work on somewhat different principles than a Turing machine and have features such as random-access memory, that a Turing machine wouldn't have. A Turing machine would also need to have unlimited amount of storage space, which makes building one in practice an impossibility.
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