Computer is an electronic automatic Machine. which is capable of receiving information or data
and perform a series of operations in accordance with a set of operations. This
produces results in the form of data or information. Computer is a machine capable
of solving problems and manipulating data. It accepts and processes the data by
doing some mathematical and logical operations and gives us the desired output.
Therefore, we may define a computer as an electronic device that transforms data
into information. Data can be anything like marks obtained by you in various
subjects, it can also be name, age, sex, weight, height, etc. of all the students in
your class or income, savings, investments, etc. of a country.


A computer basically performs five major operations

Accepts data or instructions by way of input.
● Stores data.
● Processes data as required by the user.
● Gives results in the form of output.
● Controls all operations inside a computer.


This is the process of entering data and programs in the computer system. Therefore,
the input unit takes data from us to the computer in an organized manner for
The data and instructions are saved/ stored permanently in storage unit. The storage
unit performs the following major functions:
● All data and instructions, before and after processing, are stored here,and
● Intermediate results of processing are also stored here.
The task of performing operations like arithmetic and logical operations is called
processing. The Central Processing Unit (CPU) takes data and instructions from
the storage unit and makes all sorts of calculations based on the instructions given.

This is the process of producing results from the data for getting useful information.
The output produced by the computer after processing is stored inside the computer
before it is given to you in human readable form. The output is also stored inside
the computer for further processing.
Controlling of all operations like input, processing and output are performed by
control unit. It takes care of step by step processing of all operations inside the




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