ENIAC (Electronic Numerical Integrator And Computer)
It was the first digital computer developed at University of Pennsylvania in the 1940s by John Mauchly and J. Presper Eckert. It was designed for the Army for advanced calculations at high speeds and to allow charting of ballistic trajectories for artillery ammunition. By the time it was invented WWII was over and was instead used for calculations for the atomic bomb, and other calculations for advancing war technology.