In 1946 the first computer was announced. It was called ENAIC, which stood for Electronic Numerical Integrator and Computer. It was a superfast calculator with some input functions with punch cards. ENIAC took up a large room and required several people to operate. She operated with vacuum tubes and could output 5,000 addition problems in one second.The computer used 170,000 watts of power, weighed 28 tons, had 17,840 vacuum tubes, filled a large building and cost $487,000. (or ten million dollars! in today's standards).
Although ENIAC was designed and primarily used to calculate artillery firing tables for the United States Army's Ballistic Research Laboratory, its first program was a study of the feasibility of the thermonuclear weapon
ENIAC could be programmed to perform complex sequences of operations, including loops, branches, and subroutines.

  The typical computer you use today is of course tens of thousands of times faster..