they output the results. When talking about computers, both hardware and software need to be considered. The former refers to the actual machinery, whereas the latter refers to the programs, which control and coordinate the activities of the hardware while processing the data. The first computer was built in 1930 but since then computer technology has evolved a great deal. There are three different kinds of computers in use today: the mainframe, the minicomputer and microcomputer. These all have one thing in common: they operate quickly and accurately or just in solving problems