Who invented the first computer?

Charles Babbage invented the first computer in in 1822

That really depends on the definition of a "computer". The usual story that computer scientists learn in their introductions is Charles Babbage, who devised a "Difference Machine" to count polynomials, which however, was not yet constructed in his time.

Another "first" was Konrad Zuse's finished in 1938, which was the first programmable computer.