COMPUTER

Computer is derived for latin word “computare” which means “calculate”. In another way computer can defined as an electronic digital and automatic machine which takes input from the user , process it, stores it if necessary and gives output in desired form. Every computer system requires data and instructions to produce useful information. A computer system gets data and instruction through peripheral devices like keyboard, mouse, etc. in the same way the information from the computer are displayed to users through peripheral devices like monitor. All the hardware devices connected to a computer are known as peripheral devices. They are also known as I/O devices (Input/output Devices).A Computer consists of main processing unit called central processing unit (CPU) or processor (or microprocessor), main memory(normally RAM), input devices(normally keyboard, mouse), output device(normally monitor, printer) and auxiliary storage (normally hard disk, floppy disk).