8Computer is an advanced electronic device that takes raw data as input from the user and process it under the control of set offer instructions all program give the result output and saves it for the future use. Today’s world is an information richworld and it has become a necessity  for everyone to know about computers. Purpose of this tutorial is to introduce you about computer and its components.

Functions of computer

Any digital computer carries out five functions in gross terms:

  • Take data as input
  • Stores the data / instruction in its memory and use them when required.
  • Processes data and convert it into Useful information.
  • Generate the output

Control all the above 4 steps


Computer is an electronic data processing device which

  • Accepts and stores data input,,
  • Processes the data input ,and
  • Generates the output in a required format.

1) High speed

  • Computer is a very fast device.
  • It is capable of performing calculation of very large amount of data.
  • The computer has units of speed in microsecond nanosecond and when the Picoseconds.
  • It can perform millions of calculations in a few seconds as compared to man who will spend many months for doing the same task.

2) Accuracy

  •  In addition to being very fast.
  • The calculations are 100% error free.
  • Computers perform all jobs with 100% accuracy provided that correct input has been given.


3) Storage capability

  • Memory is a very important characteristics of computers.
  • A Computer has much more storage capacity than human beings.
  • It can store large amount of data.
  • It can store any type of data such as images, videos, text audio and many others.



  • 4) Diligence
  • Unlike human beings a computer is a free from monotony tiredness and lack of concentration
  • It can work continuously without any error and burdom.
  • It can do repeated work with same speed and accuracy


5) versatility

  •   A Computer is very versatile machine.
  • A Computer is a very flexible in performing the jobs to be done.
  • This machine can be used to solve the problems related to various fields.
  • At one instant it may be solving a complex and difficult problem and the very  next moment it may be playing a card game.



6) Reliability 

  • A computer is a reliable machine.
  • Modern electronic components have long lives.
  • Computers are designed to make maintenance easy.


7) Automation

  • Computer is an automatic machine.
  • Automation means ability to perform the give task automatically.
  • Once a program is given to computer i.e,, store in Computer memory, the program and instruction can control the program execution without human instruction.



Following list demonstrate the disadvantage of computer in today’s Arena.

  1. A computer is a machine that has no intelligence to perform any task
  2. Each instructions has to be given to computer
  3. Computer cannot take any decision on it own.


1• its functions  as per users instructions so it is fully depend on human.




The operating environment of computer should be dust free and ritual

  1. No feelings    

Computer have no feelings or emotions it cannot make judgement based on feeling test experience and knowledge on like human being.

COMPUTER – Applications

1) Bussiness

A computer has high speed of calculation religious accuracy reliability or versatile which made it and integrated part in all business organisation.

Computer is used in business organisation for:

  • Payroll calculation
  • Budgeting
  • Sales analysis
  • Financial forecasting
  • Managing employees database
  • Maintenance of stocks etc.Computer

computer types


  1. PC personal computer

2.workstation computer

  1. Workstation9
  2. Mini computer
  3. Mainframe

  1. Supercomputer

PC computer  > A PC can be defined as a small relatability expensive computer designed for an individual user PC based on microprocessor technology that enable manufactures to put an entire CPU for one shipBusinesses are personal computers for word processing accounting desktop publishing and running is paid seat and Database Management applications at home the most popular used for personal computer is playing game and suffering internet in terms of power now a days high end model of the machine tours and PC offer the same computing power and graphic capability as low and workstations sun microsystems have late package and deal

workstation >  workstation is a computer used for engineering application (CAD/CAM) Desktop, publishing ,software ,development and other such a type of applications which require a moderate amount of computing power and relatively high quality graphic capabilities. 

Workstations generally come with a large high resolution graphics screen large amount of Ram inbuilt Network Support and a graphical user interface most workstation also have aA mass storage device as such a disk drives but special type of work station called a diskless workstation comes without a disc drive.

Common operating system for workstation are UNIX and Windows NT.LikePC, workstation are also single user computer like PC but are typical linked together to form a local area network although they can also be used as a stand alone system.

Minicomputer > it is the mid size multiprocessing system capable of supporting up to 250 users simulate neously.

Mainframe  > mainframe is a very large in size and is an expensive computer capable of supporting hundreds of even thousands of users simulate Nestle Mein frame executemany program concurrently and supports much simulator execution of programs

Supercomputer super computers are one of the fastest computers currently available super computers are very expensive and are employed for specialised applications that require immense amount of mathematical calculations number crunching for example weather forecasting scientific simulations animated graphics fluid dynamic calculation nuclear energy research Electronic design and analysis of geological data example in petrochemical prospective.


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