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What is a computer?
A computer is, at its most basic, a machine which can take instructions, and perform computations based on those instructions.
Computers range from the very small to the very large. Some are capable of doing millions of calculations in a single second, while others may take long periods of time to do even the most simple calculations.
Based on Capacity, speed and reliability computers can be divided into the following categories of computers:
Super computer
Mainframe Computer
Minicomputer
Microcomputer
