A Computer is an electronic machine that can process almost all kinds of data. The programmable feature has made this machine unique as compared to other machines. The computer may have different application areas like in military, hospital, space-research and various activities. This is possible due to programs for different applications.

now what is a program?
A program is a set of instructions, written in a particular sequence in a computer-related language.

Block diagram of a Computer:
i. Input device
ii. Memory
iii. Central Processing Unit(CPU)
iv. Output device