Mainframe computers are those which can handle 100 of user at a time. That mean we cannot run Pc operating system on mainframe. Mainframe computers have special operating system that can handle parallel user processing, transactions and time sharing. These computers run best run on linux operating system. In mainframe computers there are many processors working and integrating with each other. Like host processor, back-end processor and front-end processor. Host processor give instructions to back-end and front-end processors. Back end processor get record from the storage. Front-end processor sends the data to the interconnected users.Micro computer are general purpose computer also called Pc. They are used at our homes. Micro computer can handle one user at a time. These computer are used for documentation, making power point presentation , printing tasks and other usual tasks that u all know.