Definition of computer is electronic machine operating under the control of instructions stored in its own memory.

Computer is tool to process data that is contain of raw facts, figures and symbols and processing it to become information that is organized, meaningfull and usefull.

Information processing cycle

Input - process - output - storage - communication

Two main components on the motherboard :
CPU : also called processor, carrries out intructions that tell computer what to do.
Memory : Temporary holding place for data and instructions.