An electronic device designed to accept data (input), perform prescribed mathematical and logical operations at high speed (processing), and supply the results of these operations (output). A digital computer processes data as numbers and includes mainframe computers, minicomputers, and microcomputers. In contrast, an analog computer represents data by measurable quantities, such as voltages. See also ANALOG, DIGITAL, LOCAL AREA NETWORK, MAINFRAME COMPUTER, MICROCOMPUTER, MINICOMPUTER, OFFICE AUTOMATION.