It is designed to handle very high volume input and output (I/O)and and emphasized throughout computing
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"Mainframe" redirects here. For other uses, see Mainframe (disambiguation).
A pair of IBM mainframes. On the left is the IBM z Systems z13. On the right is the IBM LinuxONE Rockhopper.
An IBM System z9 mainframe
Mainframe computers or mainframes (colloquially referred to as "big iron")[1] are computers used primarily by large organizations for critical applications; bulk data processing, such as census, industry and consumer statistics, and enterprise resource planning; and transaction processing. They are larger and have more processing power than some other classes of computers: minicomputers, servers, workstations, and personal computers.
The term originally referred to the large cabinets called "main frames" that housed the central processing unit and main memory of early computers.[2][3] Later, the term was used to distinguish high-end commercial machines from less-powerful units.[4] Most large-scale computer-system architectures were established in the 1960s, but continue to evolve. Mainframe computers are often used as servers.