Here have the basic information about computer.

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2. FUNDAMENTAL INFORMATION
ABOUT COMPUTER
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3. WHAT IS COMPUTER?
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4.  A computer generally means a programmable
machine.
 A computer is a device that accepts
information and manipulates it for some
result based on a program or sequence of
instructions on how the data is to be
processed.
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7. INPUT+PROCESS=OUTPUT
INPUT
• Data Sheets
• Labor
• Computer
• Desk
• Chair
• Electricity
PROCESS
• Data Entry
• File Data
Sheets
OUTPUT
• Entered
Data
• Filed Data
Sheets
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9. Computer
Classification:
 Computers can be generally classified by size
and power, There are :
 · Personal computer: A small, single
user computer based on a microprocessor. In
addition to the microprocessor, a personal
computer has a keyboard for entering data,
a monitor for displaying information, and
a storage device for saving data.
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10.  Workstation: A powerful, single-user
computer. A workstation is like a personal
computer, but it has a more powerful
microprocessor and a higher-quality monitor.
 Minicomputer: A multi-user computer
capable of supporting from 10 to hundreds of
users simultaneously.
 Mainframe: A powerful multi-user computer
capable of supporting many hundreds or
thousands of users simultaneously.
 Supercomputer: An extremely fast computer
that can perform hundreds of millions of
instructions per second.
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12. Hardware :Consists of devices, like the computer
itself, the MONITOR,
KEYBORD, PRINTER, MOUSE and SPEAKERS.
Inside the computer there are more bits of
hardware, including the motherboard, where
you would find the main processing chips that
make up the central processing unit (CPU). The
hardware processes the commands it receives
from the software, and performs tasks or
calculations.
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13. HARDWEAR DEVICES:
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14. MONITOR: A monitor or a display is an electronic
visual display for computer.
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15. The Different Types of PC Monitors:
PC monitors come in two different flavors, each
of which is known by a popular TLA (three-
letter acronym): LCD and CRT.
*LCD: Stands for liquid crystal display. The
newer, flatter type of computer screen.
*CRT: Stands for cathode ray tube. The
traditional, glass-screen, television-set-like
monitor.
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17. KEYBORD:A keyboard is the set of typewriter-like keys that
enables you to enter data into a computer. Computer
keyboards are similar to electric-typewriter keyboards but
contain additional keys.
The keys on computer keyboards are often
classified as follows:
*Alphanumeric keys  Letters and numbers
*Punctuation keys  Comma, period,
semicolon, and so on.
*Special keys Function keys, control
keys, arrow keys, Caps Lock key, and so on.
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19. MOUSE:A device that controls the movement of
the cursor or pointer on a display screen.
Different Types:
Ball Mouse
Optical Mouse
Laser Mouse
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21. PRINTER: A printer is any device that
prints text or illustrations on paper.
There are many different types of printers.
 Daisy-wheel
 Dot-matrix
 Ink-jet
 LCD & LED
 Line printer
 Thermal printer
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23. SPEAKERS: Speakers are popular output
devices used with computer systems. They
receive audio input from the
computer's sound card and produce
audio output in the form of sound waves.
Different Types of Computer
Speakers:
2.1 Speaker
5.1 Speaker
7.1 Speaker
Wireless
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25. SOFTWEAR:
Software means computer instructions or data.
Anything that can be stored electronically is
software, in contrast to storage devices and display
devices which are called hardware.
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26. Categories of Computer Software:
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28. CPU - CENTRAL PROCESSING UNIT
CPU is the abbreviation for central processing unit.
Sometimes referred to simply as the central
processor, but more commonly called processor,
the CPU is the brains of the computer where most
calculations take place. In terms of computing
power, the CPU is the most important element of
a computer system.
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30. MAIN MEMORY
ROM
AND
RAM
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31. ROM(Read-only memory) :
Read-only memory, or ROM, is a form of
data storage in computers and other
electronic devices that can not be easily
altered or reprogrammed. RAM is
referred to as volatile memory and is lost
when the power is turned off whereas
ROM in non-volatile and the contents are
retained even after the power is
switched off.
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32. RAM(Random-access-memory):
Random-access memory, or RAM, is a
form of data storage that can be accessed
randomly at any time, in any order and
from any physical location in contrast to
other storage devices, such as hard drives,
where the physical location of the data
determines the time taken to retrieve it.
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33.  Media is the material used in devices.
 Example : Floppy Disk and CD-ROM
 If CD-ROM is the media then CD-ROM drive is
the device.
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34. OS - operating
system:
The operating system is the most
important program that runs on a computer. Every
general-purpose computer must have an
operating system to run other programs.
Operating systems perform basic tasks, such as
recognizing input from the keyboard,
sending output to the display screen, keeping
track of files and directories on the disk, and
controlling peripheral devices such as disk
drives and printers.
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39. Computer Network : A computer
network is a group of computer
systems and other computing
hardware devices that are linked
together through communication
channels to facilitate communication
and resource-sharing among a wide
range of users. Networks are
commonly categorized based on their
characteristics.
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41. Categories of computer network:
There are many types of networks, including:
Local Area Networks (LAN)
Personal Area Networks (PAN)
Home Area Networks (HAN)
Wide Area Networks (WAN)
Metropolitan Area Networks (MAN)
Backbone Networks (BBN)
Global Area Networks (GAN)
Campus Networks
Internetworks
The Internet
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