The ENIAC (Electronic Numerical Integrator And Computer) is generally considered the world's first computer. It was designed by two men, J. Presper Eckert and John Mauchly. Both Eckert and Mauchly were from the University of Pennsylvania. They also had a team of other developers who assisted them in their work. World War II led to shortages in the male workforce, so a team of female programmers worked on the development of the ENIAC. The computer was completed in 1946, and it was so large that it took up space in an entire room. The original intent of the ENIAC was for analysis of weaponry during World War II.
Before the invention of the ENIAC, there were other computing machines. For example, Alan Turing invented the Turing Machine in Great Britain. It was a device for mathematical computation, and it was later used to aid in breaking the Enigma code. Before this, tabulating machines were used to record data. These machines were precursors to modern computers.