Computers that are used in banking, airlines and railways, can accommodate more than 1000 workstations at once, process data at very high speed and support concurrent programmes, are

Mainframe computers serve banking, airlines and railways and support over a thousand workstations at once.

Microcomputers are small personal machines, not large shared systems.

Workstations serve a single high-end user rather than thousands.

Supercomputers focus on raw calculation speed for scientific work.

Mainframes handle huge numbers of transactions with high reliability.

They can run many concurrent programs for many users together.