A computer is an electronic device that can perform calculations and logical operations at high speeds. It can store, process, and retrieve data whenever needed. The activity of processing data using a computer is called data processing, where raw data is input and processed to produce useful information output. A computer takes in data as input, stores it in memory, processes the data to convert it into information, generates an output, and controls these steps. Computers are used in many fields including business, banking, insurance, education, marketing, and healthcare. Computers range in size from personal computers for single users to mainframes and supercomputers that can support hundreds of users simultaneously and perform extremely fast calculations.

1. SUBMITTED BY
MOHIT DESWAL
SUBMITTED TO
MISS. ANJU MANN

3. WHAT IS COMPUTER
•The word computer come from the
“computer ” which means “to calculate “.
•Thereby, A computer is an electronic device
that can perform arithmetic operations as
well as logical operations as high speed.
•A computer is also called a data processor
because it can store, process and retried
data whenever desired.

4. DATA PROCESSING
Data Process Information
•The activity of processing data using a computer is called data
processing
•Data is raw material used an input and information is processed
data obtained as output of data processing
•For example if we read a news paper there is lot of data is
available but we want some particular news that is information

5. FUNCTIONNALITIES OF A COMPUTER
•If we look at it in a very broad sense, any digital computer
carries out the following :
• step 1 - Take data as input .
• step 2 – Store the data /instruction in its memory and uses them
as required .
• Step 3 – Processes the data and converts it into useful
information .
• Step 4 – Generates the output .
• Step 5 – Controls all the above four steps
Input Process Output

13. APPLICATIONS
FOLLOWING ARE THE APPLICATIONS OF COMPUTER IN VARIOUS FIELDS:-
BUSINESS
BANKING
INSURANCE
EDUCATION
MARKETING
HEALTH CARE

17. ON THE BASIS OF SIZE/CAPACITY
TYPES OF COMPUTER
SR.
NO.
TYPE Specifications
1 PC(Personal
Computer)
It is a signal user computer system having moderately
powerful microprocessor.
2 Workstation It is also a single user computer system, similar to
personal computer however has a more powerful
microprocessor.
3 Mini Computer It is a multi-user computer system, capable of supporting
hundreds of users simultaneously.
4 Main Frame It is a multi-user computer, capable of supporting
hundreds of users simultaneously. Software technology is
different from minicomputer.
5 Super Computer It is an extremely fast computer, which can execute
hundreds of millions of instructions per second.