Mainframe computer
Mainframe computers are very large, often can fill an entire room. They can store a large amount of information, can execute many tasks at the same time, can communicate with many other users at same time, and are very much expensive. . The cost of a mainframe computer is into the millions of dollars. Mainframe computers normally have many terminals connected to them. These terminals resemble small computers but they are only devices used to transmit and receive information from actual computer with wires. Terminals can be located in same room with mainframe computer, but they can also stored in different rooms, buildings or cities