Turing Machine – 1936

2.1 Turing Machine – 1936

Introduced by Alan Turing in 1936, Turing machines are one of the key abstractions
used in modern computability theory, the study of what computers can and cannot do. A
Turing machine is a particularly simple kind of computer, one whose operations are
limited to reading and writing symbols on a tape, or moving along the tape to the left or
right. The tape is marked off into squares, each of which can be filled with at most one
symbol. At any given point in its operation, the Turing machine can only read or write
on one of these squares, the square located directly below its "read/write" head.