A computer is an electronic device, operating under the control of instructions stored in its own memory, that can accept data (input), process the data according to specified rules, produce information (output), and store the information for future use. Computers contain many electric, electronic, and mechanical components known as hardware.
Personal Computer
A personal computer (PC) is a computer that can perform all of its input, processing, output, and storage activities by itself and is intended to be used by one person at a time. Most personal computers today also can communicate with other computers and devices.
Mobile Conmputer
A mobile computer is a portable personal computer, designed so that a user can carry it from place to place. A user is anyone who interacts with a computer or mobile device, or utilizes the information it generates.