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The Mainframe computers known as big iron computers used primarily by large organizations for critical applications, bulk data processing such as census, industry and consumer statistics, enterprise resource planning and transaction processing.

The term originally referred to the large cabinets called "main frames" that housed the central processing unit and main memory of early computers.

The Modern mainframe design is generally less defined by single-task computational speed (typically defined as MIPS rate or FLOPS in the case of floating point calculations)

Also we can say that:-

Redundant internal engineering resulting in high reliability and security

Extensive input-output facilities with the ability to offload to separate engines

Strict backward compatibility with older software

High hardware and computational utilization rates through virtualization to support massive throughput.


Main Frame Computer