1. A computer that performs calculations and logical operations with quantities represented as digits, usually in the binary number system.
2. A device capable of accepting data in the form of facts and figures, manipulating them in a prescribed way, and supplying the results of these processes as meaningful information.

This device usually consists of input and output devices, storage, arithmetic and logic units, and a control unit. Usually an automatic, stored-program machine is implied.

A machine that uses electronic circuitry in the main computing element to perform arithmetic and logical operations on digital data; for example, data represented by numbers or alphabetic symbols.

This is done automatically with an internally stored program of machine instructions.

Such instruments are distinguished from calculators on which the sequence of instructions is externally stored and is impressed manually (desk calculators) or from tape or cards (card-programmed calculators).