A computer is an electronic device that can perform a variety of tasks by executing instructions. It is versatile and can handle tasks like documentation, accounting, designing, airlines/railways bookings, weather forecasting, and more. The central processing unit carries out the instructions of computer programs by performing basic arithmetic, logical, control and input/output operations. Other key parts include the monitor for visual display, mouse for pointing/selecting, keyboard for text input, printer for printing output, modem for connecting to networks, and speakers for audio output. Computers are characterized by their speed, accuracy, reliability, storage capacity, versatility, and ability to reduce manpower and paperwork.

2. WHAT IS COMPUTER?
The word is derived from ‘compute’, which means to
calculate.
A Computer is an electronic device that can perform a variety
of tasks by executing a given set of instructions.
It is a versatile and can handle multiple tasks like
documentation, accounting, designing, airlines, railways and
other bookings, weather forecasting and many more.
The acronym for COMPUTER is Common Oriented Machine
Particularly Used for Trade and Education Research.

3. ORGANIZATION OF COMPUTER
SYSTEM

4. CENTRAL PROCESSING
UNIT
A central processing
unit (CPU) is the electronic
circuitry within
a computer that carries out
the instructions of a computer
program by performing the
basic arithmetic, logical,
control and input/output (I/O)
operations specified by the
instructions.

5. MONITOR
A monitor or a display is
an electronic visual
display for computers.
The display device in
modern monitors is
typically a thin film
transistor liquid crystal
display (TFT-LCD) thin
panel, while older monitors
used a cathode ray
tube (CRT) about as deep
as the screen size.

6. MOUSE
In computing, a mouse is
a pointing device that
detects two-
dimensional motion
relative to a surface. This
motion is typically
translated into the motion
of a pointer on a display,
which allows for fine
control of a graphical user
interface.

7. KEYBOARD
A keyboard typically has characters engraved or printedon
the keys and each press of a key typically corresponds to
a single written symbol.
However, to produce some symbols requires pressing and
holding several keys simultaneously or in sequence. While
most keyboard keys produce letters, numbers or signs
(characters), other keys or simultaneous key presses can
produce actions or execute computer commands.

8. PRINTER
In computing, a printer is a peripheral which
makes a persistent human readable
representation of graphics or text on paper or
similar physical media.

9. MODEM
A modem (modulator-demodulator) is a device
that modulates signals to encode digital
information and demodulates signals to decode the
transmitted information.

10. SPEAKER
Computer speakers, or multimedia speakers,
are speakers external to a computer, that
disable the lower fidelity built-in speaker.

11. CHARACTERISTICS OF ACOMPUTER
1. Speed
2. Accuracy
3. Reliability
4. Storage Capacity
5. Versatility
6. Reduction in Manpower
7. Reduction in Paper Work