What is a Computer?
>> The computer is a programmable electronic device to accept data, process data, store data and display meaningful information.

DATA: Data is a raw material of information.
INFORMATION: Proper collection of the data is called information.

Characteristics of a computer:

SPEED:
In general, no human being can compete in solving complex computations faster than a computer.

ACCURACY:
Since the computer is programmed, so whatever input we give it gives accurate results.

STORAGE:
The computer can store mass storage of data with the appropriate format.

DILIGENCE:
The computer can work for hours without any break and creating an error.

VERSATILITY:
We can use a computer to perform completely different types of work at the same time.

POWER OF REMEMBERING:
It can remember data for us.

NO IQ:
The computer doesn’t work without instruction.

NO FEELING:
The computer doesn’t have emotions, feelings, experience, knowledge

Applications areas of computer

  • Banking
  • Education
  • Hospital
  • Business
  • Insurance
  • Marketing
  • Healthcare
  • Engineering
  • Transportation

Computer and its components

CPU: It is the heart and mind of the computer, without this unit computer unable to process.

Keyboard: This is an input device that is used to input the data into the computer.

Mouse: This is also an input device that is used to input the data into the computer.

Monitor: This is an output device that is used to display the results of instructions.

Types of Computer

PC: It is a single-user computer system, having a moderately powerful microprocessor.

Workstation: It is also a single user computer system, similar to a personal computer, however it has a powerful microprocessor.

Minicomputer: It is a multiuser computer system capable of supporting hundreds of users simultaneously.

Mainframe computer: It is a multiuser computer system capable of supporting about five hundred users simultaneously. Software technology is different from a mini-computer.

Supercomputer: It is an extremely fast computer, which can execute hundreds of millions of instructions per second.

Block Diagram of computer

Computer Hardware
Hardware represents the physical and tangible components of a computer or The components that can be seen and touched.

Example of a Computer Hardware

  • Mouse
  • Keyboard
  • Monitor
  • Cpu

Input Devices
Those devices which provide or give data to the computer system.
Ex: Mouse, keyboard, joystick, microphone, trackball, graphic tablet, etc,

Output Device
Those devices which display or provide information from the computer.
Ex: Monitors, Speaker, Printer, etc

Operating System
An operating system is a system that manages computer hardware and software resources and provides common services for computer programs.

File
A computer file is a computer resource for recording data discretely in a computer storage device. Just in words can be written to paper, so can information be written to a computer file.

Folder
A folder also called a directory has a special space used to store files, other folders, and shortcuts in a computer.

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