Turing Machine
An abstract mathematical machine Turing described in 1936 — not a real physical device, but a thought experiment.
An abstract mathematical machine Turing described in 1936 — not a real physical device, but a thought experiment. It has infinite tape, a read/write head, and a set of rules. Turing proved that any computation that can be carried out at all can be carried out by such a machine. This is the theoretical foundation of all modern computers.