Full form of computer | Classifications of computer

Many people today say that COMPUTER stands for (full form) Common Operating Machine Purposely Used for Technological and Educational Research. This i personally will call a common myths because it does not (definition) describe accurately the main function of computer since computer is produced mainly for calculation even before the high technology era.

The  full form of computer is just below:

  • C for Commonly
  • O for Operated
  • M for Machine
  • P for Particularly
  • U for Used for
  • T for Technology
  • E for Education and
  • R for Research

Others say that full form of computer is

  • Commonly
  • Operated / Output
  • Machine
  • Practically / Particularly
  • Used in/for
  • Trade / Technology/Teaching
  • Education &
  • Research

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Computer is not an acronym, it is a word coined from a word “compute” which means to calculate. In other words you can simply say that computer is an electronic device which is used for fast calculation.

So i can say that  “A computer is a general purpose electronic device that is used to perform arithmetic and logical operations automatically. A computer consists of a central processing unit and some form of memory.”

COMPUTER = Arithmetical Logical Unit (ALU) +  Control Unit (CU)  

ALU: Arithmetic Logical Unit is used to carry out arithmetic and logical operation.

CU: Control unit is used to change the order of operations in response to stored information.


Computer operations

A Computer perform its operation in stages though very fast. First, the computer receives information (data) through the input devices like keyboards and secondly, a small or temporary storage of the data in the light memory before thirdly, processes this information. Finally, the result of the processed data is produced as output using the output devices like monitor or printer. Now lets us look further into what happens inside the computer before we say computer operations is complete.


Input is the entering of data and programs into the computer system. Since computer is an electronic Machine like any other devices it takes in raw data and performs some activities and gives out processed data. Here the input unit or device takes data from user to the computer in well organized manner for processing.


The process of saving data and instructions is known as storage were data which has to be fed into the computer system before the real processing begins. This happens because the processing speed of central Processing Unit (CPU) is so Quick that the data has to be given to CPU with the same speed ,therefore the data is first collected in the storage unit for quick access and processing. Operations of the storage stage is

  • All information and commands are stored here before and after processing
  • After Results Of Processing Are Also Stored Here


The work of performing Arithmetic and logical operation is called processing, the Central Processing Unit (CPU) takes data and/or instructions from the storage unit and perform the needed calculations based on the instructions given and the type of data provided via the input unit. The data is sent to Arithmetic logical unit which does the Arithmetic and logical operations.


The output unit takes the processed data from the system and present it to the user in readable forms. The output may be soft copy i.e on the monitor or hard copy in form of print out.

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Computer can be classified based on


  • Digital Computer
  • Analog Computer
  • Hybrid Computer


  • First generation computers: (1940-1956) based on Vacuum tubes.
  • Second generation computers: (1956-1963) based on Transistors
  • Third generation computers: (1964-1971) based on Integrated Circuits
  • Forth generation computers: (1971- Present) Based on Microprocessors
  • Fifth generation computers: (Present and Beyond) based on Artificial Intelligence

Working Area

  • Super computer
  • Work frames
  • personal computer
  • Desktops
  • Laptops
  • Palmtops etc.