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What is a Computer?

Computers are machines that can be used for performing calculations automatically. They can perform complex and repetitive procedures quickly, precisely and reliably and can quickly store and retrieve large amounts of data.

The physical components from which a computer is constructed (electronic circuits and input/output devices) are known as "hardware". Most computers have four types of hardware components: input, processor, storage (main memory, auxiliary storage) and output.

Input and output (I/O) devices allow the computer to communicate with the user and the outside world. The CPU (central processing unit) executes programs ("software") which tell the computer what to do.

The two principal characteristics of a computer are: It responds to a specific set of instructions in a well-defined manner. It can execute a prerecorded list of instructions (a program).

Classification of compu