A computer is a device which performs high-speed calculations. It first started with people trying to do quick-and-easy calculations. First came the abacus(most people think it's not a computer). Then came all the giant computers which worked with vacuum tubes (valves). These valves workes as transistors (switches with either turn on and off). On for 1 and off for 0. A computer uses binary language, which stores numbers and strings (words), and other data with only 2 digits (0 and 1)