The first electronic computer is generally considered to be the ENIAC, which stands for Electronic Numerical Integrator and Computer. Developed during World War II and completed in 1945, ENIAC was designed by John W. Mauchly and J. Presper Eckert at the University of Pennsylvania. It was a massive machine, occupying a large room and using over 17,000 vacuum tubes. ENIAC was capable of performing a wide range of calculations, making it a groundbreaking innovation in the field of computing and paving the way for the development of modern computers.