In simple terms, mainframe computers are super-fast and reliable machines that help process large amounts of data quickly and efficiently . They are designed to ensure that critical systems, like banking and finance, remain available 24/7 without any interruptions. A mainframe computer is large but not as large as a supercomputer and has more processing power than some other classes of computers, such as minicomputers, workstations, and personal computers. A mainframe computer , or mainframe , is also known as a central computer . It is a large, powerful, and expensive computer , mostly used by large companies for bulk data processing and critical applications. It processes a large amount of data used in the processing of bank transactions, census, statistical work, enterprise resource planning (ERP), database management, etc. What is a mainframe computer ? A mainframe , also known as big iron, is a high-performance computer used for large-scale, compute-intensive purposes and tasks that require greater availability and security than smaller-scale machines. Historically, mainframes have been associated with centralized rather than distributed computing. But that distinction has blurred as smaller types of computers become more powerful and mainframes increasingly multipurpose. The IBM System z provide a high level ...