What is Computer | Computer Definition | Computer Classification

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Definition – What does Computer mean?

What is कंप्यूटर : Computer is an electronic device that is designed to work with Information. The term computer is derived from the Latin term ‘computare’, this means to calculate or programmable machine. कंप्यूटर can not do anything without a Program. It represents the decimal numbers through a string of binary digits. The Word ‘कंप्यूटर’ usually refers to the Center Processor Unit plus Internal memory.

Charles Babbage is called the “Grand Father” of the कंप्यूटर. The First mechanical कंप्यूटर designed by Charles Babbage was called Analytical Engine. It uses read-only memory in the form of punch cards.

कंप्यूटर is an advanced electronic device that takes raw data as input from the user and processes these data under the control of set of instructions (called program) and gives the result (output) and saves output for the future use. It can process both numerical and non-numerical (arithmetic and logical) calculations.

Digital कंप्यूटर Definition

The basic components of a modern digital कंप्यूटर are: Input Device, Output Device, Central Processor Unit (CPU), mass storage device and memory. A Typical modern computer uses LSI Chips.  Four Functions about कंप्यूटर are:

accepts data Input
processes data Processing
produces output
stores results Storage

Input (Data):

Input is the raw information entered into a कंप्यूटर from the input devices. It is the collection of letters, numbers, images etc.


Process is the operation of data as per given instruction. It is totally internal process of the कंप्यूटर system.


Output is the processed data given by कंप्यूटर after data processing. Output is also called as Result. We can save these results in the storage devices for the future use.

Computer Classification: By Size and Power

Computers differ based on their data processing abilities. They are classified according to purpose, data handling and functionality.

According to functionality, computers are classified as:

• Analog कंप्यूटर: A कंप्यूटर that represents numbers by some continuously variable physical quantity, whose variations mimic the properties of some system being modeled.
• Personal कंप्यूटर: A personal computer is a computer small and low cost. The term”personal कंप्यूटर” is used to describe desktop computers (desktops).
• Workstation: A terminal or desktop computer in a network. In this context, workstation is just a generic term for a user’s machine (client machine) in contrast to a “server” or “mainframe.”
• Minicomputer: A minicomputer isn’t very mini. At least, not in the way most of us think of mini. You know how big your personal कंप्यूटर is and its related family.
• Mainframe: It refers to the kind of large computer that runs an entire corporation.
• Supercomputer: It is the biggest, fastest, and most expensive computers on earth.
• Microcomputer: Your personal computer is a microcomputer.

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