It is an age of computer. In every field the computer gains its position. In this modem world, the man cannot live without computer.

Computers are improved models of calculating machines. The functions of computer now range from solving complex mathematical problems to space rocket technology and star-war projects to personal problems of day to day life. Nowadays computers invaded every walk of human life like trade, commerce, industry, education and entertainment etc. Computers are first demanding in India. By the end of the century computers dominate our lives more than any machine invented by man up till now.

Most of us think that computer is a device that can do arithmetic very fast. But it is much more than that. It is a machine that can choose copy, compare and perform many other operations that are done by man. A computer is a fast and accurate electronic symbol, “data’ manipulating machine. It is made to automatically accept, store and process the ‘data’ given to it, inorder to give the results.

A computer accepts the data written in its own language either in numeric or non numeric symbols in a set method called ‘programme’. This programme simply instructions to the computer written in a systematic method for telling it, what to do. This data is fed in the form of binary electrical signals in two. In computers terminology one comes across the words ‘software’ means the programmes needed to make computer work.

Languages like BASIC, COBOL, and FORTRAN are normally being used to make the computers work. BASIC stands for beginner all purpose symbolic instruction code, common basic oriented language is represented as “COBOL and FORTRAN stands for formula transaction.

Computers work at very high speed accurately and it is most useful machine, man has ever invented. The time required to execute basic operation such as addition is usually measured in micro second (one billionth the second) for a smaller computer and nano second (one billionth of a second) for a bigger computer runs for hours and days without doing errors.

What we generally call computer is infact a group of the integrated parts that work together known as computer system. A basic computer system or simply computer is layman’s language consists of ‘input’ ‘output’ devices and central processing unit.

Computers differ in size and design. Sizes vary from the smallest micro computers to super computers. In general larger the size of the computer grater is its processing speed, personal or micro computer are to smallest general purpose computers like Mini computers, and Main frame computers are bigger than personal computer with faster working speed. The super computers are designed to process complex scientific applications. There are the largest, fastest and most expensive computers in the world. The traditional design of computer is single control processing. However computers with multi processing design are also produced for faster computing speed. Computers are classified by the type of data they are designed to process. Digital computer direct count discrete values and give accurate results. Analog Computers do not compute directly with numbers but they deal with variables. Hybrid Computers are those with mixed function of digital and Analog computers. Mostly digital computers are in use now.

Human beings are for superiors in intelligence to computers till now what happens in future in anybody’s guess. Computers curtail privacy of people. According to optimists computers will lead to higher standards of living and increased leisure time. The pessimists view that computers are a curse to humanity. Time only will tell what computer are for human beings.