The word Computer originates from the word compute that means to calculate. Now a day’s amazingly 80% + of work is done in computers even of non numerical nature like music composing, special effects, resume sorting, forecasting, nuclear research etc. Computer not only processes the data and makes you available the information but also able to perform the subsequent steps on the basis of processed information that’s why computer even something more than a data processing device.

Types of Computer:

1. Micro Computer: Micro computer are self contained units and usually designed to use by one person at a time.

2. Mini Computer: Minicomputer is usually designed o serve many users simultaneously, it is a medium size computer.

3. Mainframe Computer: The computer with large storage capacities and very high speed of processing as compared to micro or minicomputers.

4. Super Computer: Super computers have extremely large storage capacity and computing speed which is at least 10 times faster than others.

Advantages of Computers:

It can perform any repetitive work and calculation rapidly and accurately. Computers can store large amount of data and information for subsequent manipulation. The memory of computer can hold a program which can be explored in different ways. Computers can make decision based on different conditions. It can provide information to the user. If any error occurs in the program file, computer can automatically detect these errors and allow the user to correct them. It can draw and print graphics. The computer can converse with users through input or output devices.

Disadvantages of computers:

A computer has no brain or intelligence of its own. It cannot learn with experience. It can only perform operations as instructed by the user. It has no common sense, due to which it can carry out the instructions only as long as user needs. It can understand instructions no matter whether they are right or wrong.

The future computer technology is beyond out imagination, possible it is going to be biological computer which can understand able to reason and make logical decisions of its own a computer with send and feeling. These computers are aimed to communicate with human in their language it is going to be an intelligent computer that will process knowledge rather than data.

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