The Electrical Numerator Integrator and Calculator (ENIAC) was the first computer, and it was developed in 1946 by John Presper Eckert and John Mauchly. The duo's research was sponsored by the U.S. military.
The ENIAC was made up of about 5 million soldered joints, 10,000 capacitors and 70,000 resistors along with 17,468 vacuum tubes. The computer took up 1,800 square feet of floor space, which is the size of many average homes, and it weighed more around 30 tons. Although not as fast as today's computers, the ENIAC could perform 38 divisions, 357 multiplications and 5,000 additions in one second, which was revolutionary at the time.