Definition: A Computer is an electronic device that can perform activities that involve Mathematical, Logical and graphical manipulations.
Generally, the term is used to describe a collection of devices that function together as a system.


Computer performs the following three operations in sequence.

1. It receives data & instructions from the input device.

2. Processes the data as per instructions.

3. Provides the result (output) in a desired form.

Data: It is the collection of raw facts, figures & symbols.
Example: Names of students and their marks in different subjects listed in random order.

Information: It is the data that is processed & presented in an organized manner.
Example: When the names of students are arranged in alphabetical order, total and average marks are calculated & presented in a tabular form, it is information.

Program: Set of instructions that enables a computer to perform a given task.

Advantages of computers:

1. High speed: Computers have the ability to perform routine tasks at a greater speed than human beings. They can perform millions of calculations in seconds.

2. Accuracy: Computers are used to perform tasks in a way that ensures accuracy.

3. Storage: Computers can store large amount of information. Any item of data or any instruction stored in the memory can be retrieved by the computer at lightning speeds.

4. Automation: Computers can be instructed to perform complex tasks automatically (which increases the productivity).

5. Diligence: Computers can perform the same task repeatedly & with the same accuracy without getting tired.

6. Versatility: Computers are flexible to perform both simple and complex tasks.

7. Cost effectiveness: Computers reduce the amount of paper work and human effort, thereby reducing costs.

Limitations of computers:

1. Computers need clear & complete instructions to perform a task accurately. If the instructions are not clear & complete, the computer will not produce the required result.

2. Computers cannot think.

3. Computers cannot learn by experience.

Generations of computers:
Generation Component used
First Generation (1946-1954) Vacuum tubes
Second Generation (1955-1965) Transistors
Third Generation (1968-1975) Integrated Circuits (IC)
Fourth Generation (1976-1980) Very Large Scale Integrated Circuits (VLSI)
Fifth Generation (1980 – till today) Ultra Scale Integrated Circuits (ULSI) Micro Processor (SILICON CHIP)


I hope you learn little about computer.


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