Mainframe Computers are powerful computers used primarily by corporate and governmental organizations for critical applications, bulk data processing such as census, industry and consumer statistics, enterprise resource planning, and financial transaction processing.
The term originally referred to the large cabinets that housed the central processing unit and main memory of early computers.Later the term was used to distinguish high-end commercial machines from less powerful units.
Most large-scale computer system architectures were firmly established in the 1960s. Several minicomputer operating systems and architectures arose in the 1970s and 1980s, which were known alternately as mini-mainframes or minicomputers; two examples are Digital Equipment Corporation's PDP-8 and the Data General Nova. Many defining characteristics of "mainframe" were established in the 1960s, but those characteristics continue to expand and evolve to the present day.
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