A computer is an electronic device that takes in raw data as input, processes it according to programmed instructions, and produces output that is much faster than humans. It has input devices like keyboards and mice, a central processing unit that directs its performance, output devices like displays and printers, and a memory to store data during processing. There are different types of computers and they have various components that work together to perform tasks like games, reservations, and aircraft control.

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2. What is Computer?
 A computer is an electronic device that performs a
variety of operations. It takes the raw data as input
from the user, processes it in accordance with a set of
instructions called programs and produces the output.
It can process data a million times faster than a
human.
 Computers can do various tasks like railway
reservation, playing games, weather- forecasting,
controlling aircraft and many more.

3. Components of a Computer

4. Input Unit
The input devices make up the input unit of the
computer.
 Keyboard
 Mouse
 Joystick
 Optical mark reader (OMR)

5. Central Processing Unit (CPU)
The Central Processing Unit (CPU) is known as the
Control centre or the Brain of a computer. It directs,
governs and guides its performance.
Two main components of the CPU are :
 Arithmetic Logic Unit (ALU)
 Control Unit (CU)

6. Output Unit
The output devices attached to the computer, together
make the Output unit.
 Visual Display Units (VDU)
 Printers
 Coders
 Plotters

7. The Memory
Computers possess a memory that stores data and
information. Before sending data to the CPU for
processing, we store it in memory and then also store
the processed data before displaying it as output.

8. Types of Computers:

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