When did computer come into existence?

Answer 1

One of the first programmable computers built was Vannevar Bush's Differential Analyzer at MIT. But it was analog and mechanical with electronic torque amplifiers. It was finished around 1930.

The first programmable electronic digital computer was a Tommy Flower's Colossus at Bletchley Park. But it was classified and the public knew nothing of it. It was finished early in June 1944, followed by nine more before the end of WW2.

The first programmable electronic digital computer that the public was aware of was John Mauchley's and Presper Eckert's ENIAC. It was finished late in November 1945. However its programming system was based on the Differential Analyzer and was a dead end that no later digital computer used.

The first programmable electronic digital computer with a "modern" architecture was a prototype machine called the Manchester Baby. This lead to the design of the Manchester Mark I, which was commercialized by Ferranti, becoming the first programmable electronic digital computer that was sold in quantity in the UK, the Ferranti Mark I.

The first programmable digital computer that was sold in quantity in the US was the Remington UNIVAC I, designed by John Mauchley and Presper Eckert. It became known among the public when it correctly predicted the results of the 1952 presidential election.

There were many other computers that I cannot list here.

Answer 2

computers first came into existence in the 1940's