The document provides a history of computers from the earliest calculating devices used by humans to the five generations of modern computers. It begins with definitions of a computer and describes early mechanical aids like the abacus, Napier's bones, and the slide rule. Important early computers included the Analytical Engine, ENIAC, UNIVAC, and EDVAC. Integrated circuits marked the third generation and microprocessors defined the fourth generation, bringing networking and personal computing. The fifth generation pursues artificial intelligence.