cmputers can be classified by size and power as follows, though there is acceptable overlap. personal computer small, single-user computer based on a microprocessor In addition to the microprocessor, a personal computer has a keyboard for entering data, a monitor for displaying information, and a storage device for saving data. workstation a powerful single user computer. mini computer a multy user computer. supercomputer a computer with high speed performance . laptop with a battery and ac power supply is a personal computer witch can be carry and use multi locations,there are various kind of laptop with latest feature available in the world. tablet computer like laptop computer designed as a portable devices,it has no keyboard all the work could be with touch screen.