Alan Mathison Turing, OBE, FRS was a British pioneering computer scientist, mathematician, logician, cryptanalyst, philosopher, mathematical biologist, and marathon and ultra distance runner. He famous for making the turing machine.
Charles Babbage, FRS was an English polymath. A mathematician, philosopher, inventor and mechanical engineer, Babbage is best remembered for originating the concept of a programmable computer.
An input is something that puts in data in a computer .