FUNDAMENTALS OF COMPUTER

Detailed explanation-1: -A mainframe computer, informally called a mainframe or big iron, is a computer used primarily by large organizations for critical applications like bulk data processing for tasks such as censuses, industry and consumer statistics, enterprise resource planning, and large-scale transaction processing.

Detailed explanation-2: -Mainframes have been used for such applications as payroll computations, accounting, business transactions, information retrieval, airline seat reservations, and scientific and engineering computations.

Detailed explanation-3: -A mainframe (also known as “big iron") is a high-performance computer used for large-scale computing purposes that require greater availability and security than a smaller-scale machine can offer.