ord keeping, work, and entertainment. Mainframe Computer, a high-level computer designed for the most intensive computational tasks. Mainframe computers are often shared by multiple users connected to the computer via terminals. The most powerful mainframes, called supercomputers, perform highly complex and time consuming computations and are used heavily in both pure and applied research by scientists, large businesses, and the military. In conclusion, mainframe computers are really expensive and space consuming.2 If you want a computer just for regular everyday functions, it is recommended that you buy a PC. If you have a business and the available resources, then a mainframe might be the right choice for you....