Operating System(OS) History Introduction of operating system An interface between the computer system and the user is provided by the operating system , a system software. An operating system creates an environment in which users can run arbitrary programs and interact with software and applications in a comfortable and well-defined way. History of operating system The First Generation (1940 to early 1950) Vacuum Tubes Digital computers weren't built until World War II. At that time, calculators were created with mechanical relays. However, mechanical relays were very slow and were later replaced by vacuum tubes. These machines were huge, but still very slow. The first electrical computer was created in the year 1940 . This computer was creat...