define computer and explain their functions?
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A drawing of a usual modern desktop computer.
A computer is a machine (mostly electronic) that is able to take information (input), and process it to make new information (output).
Calculating machines are old in the history of technology. Early examples are the astrolabeand the abacus. Today a computer is a programmable machine. The two principal characteristics of a computer are: It responds to a specific instruction set in a well-defined manner and it can execute a prerecorded list of instructions (a program). There are four main processing steps in a computer:
A drawing of a usual modern desktop computer.
A computer is a machine (mostly electronic) that is able to take information (input), and process it to make new information (output).
Calculating machines are old in the history of technology. Early examples are the astrolabeand the abacus. Today a computer is a programmable machine. The two principal characteristics of a computer are: It responds to a specific instruction set in a well-defined manner and it can execute a prerecorded list of instructions (a program). There are four main processing steps in a computer:
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