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Introduction to Computers

COMPUTER is a "Commonly Operated Machine Purposely Used for Trade, Education and Research".

A computer is an electronic machine capable of performing various arithmetic and logical operations.

The computer is also capable of storing information, which can be used later.

A computer can process millions of instructions in a few seconds with high accuracy. Hence a computer can be defined as an automatic electronic machine for performing calculations or controlling operations that are expressible in numerical or logical terms. 

Computers are very accurate and save time by performing the assigned task very fast. Moreover, unlike human beings,they never get bored.

It is the ability to take instructions in the form of programs and execute them, that distinguishes a computer from a mechanical calculator. While both are able to make computations, a calculator responds simply to immediate input. In fact, most modern calculators are actually computers, with a number of pre-installed programs to help in complex tasks.

Computers accept instructions and data, perform arithmetic and logical operations and produce information. The data fed into the computer is converted into information through processing.

The first electronic computers were developed in the mid-20th century. These were very huge in size., say, the size of a large room, consuming as much power as several hundred modern personal computers (PCs). 

Modern computers based on integrated circuits are billions of times more capable than the early machines, and occupy a fraction of the space.



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