What Is Computer

A computer is a programmable electronic machine,that solve the problems about math.  The two principal characteristics of a computer are: it responds to a specific set of instructions in a well-defined manner and it can execute a prerecorded list of instructions (a program)
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Define by an author.
 An electronic device for storing and processing data, typically in binary form, according to instructions given to it in a variable program is called Computer.Computer is an advanced electronic device that takes raw data as input from the user and processes these data under the control of set of instructions (called program) and gives the result (output) and saves output for the future use.Charles Babbage is called the "Grand Father" of the computer.The First mechanical computer designed by charles Babbage was called Analytical Engine. It uses read-only memory in the form of punch cards.
this diagram shows its yaw of work.