Definitions of Computers Computer has been defined by an American institute as,  "a device capable of solving problems by accepting data, performing described operation the data and supplying the results of these operations. Various types of Computers are calculators, digital Computers and analogue Computers". Characteristics or features of computer The following are some of the important Characteristics of Computer : (1) Speed : A Computer is a very fast device,  It may perform in a few seconds, the amount of work that a human being can do in a year-- If he worked day and night and did nothing else. To put it in a different manner, a computer does in one minute, what would take a man his entire life time.. (2) Accuracy : The accuracy of a computer is consistently high and degree of accuracy of a particular computer depends upon it's design. But for a particular Computer, each and every calculation is performed with the same accuracy. Error can occur in a computer, but t...

Types of computers Any classification of computer is somewhat arbitrary. Traditionally, Computers have been classified by their size, processing speed and cost. in general, classification of computers is more relevant on the basis of : Storage Capacity Electronics Usage (1) Classification of Computers on the basis of Storage Capacity The computers are broadly classified into four categories based on there size and type : (i) Micro Computers,  (ii) mini-computers, (iii) Main frame Computers, and (iv) Super Computers (i) Micro Computer : A digital Computer whose central processing unit (CPU) consists of a micro Processor, a single semiconductor integrated circuit chip. It also contain a memory System (typically read only memory and random access memory), a bus system and input/  output ports, typically housed in a mother  board. Once less powerful than larger computers, micro computers are now as powerful as the mini computers and super mini-computers of just several years ...