Computer development is one of the greatest scientific achievements of 20th century. This is one of the wonderful and probably the most power tool ever developed. The computer has brought many changes in our daily life. Now days, the computer is an essential device for most of the organizations, offices as well individual for different purposes. We shall totally depend on the computer near future.
Computer is an electronic device which can perform varieties of tasks according to the set of instructions given to it. It accepts raw data from the user and produces meaningful result by means of data processing. The word computer is derived from the Latin word “computare” which means to compute or calculate. But the use and purpose of computer is not only limited to the computation. It can be used in different fields for various purposes, such as withdrawing money from banks through ATM (Automated Teller Machine), making online shopping through credit card, accessing library books through Internet, Preparing salary sheet using application programs, making communication through Internet of networking etc. Therefore a computer can be defined as:
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