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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
Modern computers are electronic and digital. The actual machinery wires, transistors, and circuits is called hardware; the instructions and data are called software.
All general-purpose computers require the following hardware components: memory : Enables a computer to store, at least temporarily, data and programs. mass storage device : Allows a computer to permanently retain large amounts of data. Common mass storage devices include disk drives and tape drives. input device : Usually a keyboard and mouse, the input device is the conduit through which data and instructions enter a computer. output device : A display screen, printer, or other device that lets you see what the computer has accomplis