ENIAC

ENIAC was the first practical electronic digital computer, created by replacing mechanical parts with radio tubes for switches. Despite its large size and energy use, it marked the beginning of the electronic computing era, leading to more capable and efficient computers.
 John William Mauchly and John Presper Eckart Jr United States 1946 ENIAC

ENIAC was the first practical electronic digital computer, created by replacing mechanical parts with radio tubes for switches. Despite its large size and energy use, it marked the beginning of the electronic computing era, leading to more capable and efficient computers.