描述

In computing, a computer keyboard isatypewriter-style device which uses an arrangement of buttonsorkeys to act as a mechanical lever or electronic switch.Followingthe decline of punch cards and paper tape, interactionviateleprinter-style keyboards became the main input deviceforcomputers.

A keyboard typically has characters engraved or printed on thekeys(buttons) and each press of a key typically corresponds to asinglewritten symbol. However, to produce some symbols requirespressingand holding several keys simultaneously or in sequence.While mostkeyboard keys produce letters, numbers or signs(characters), otherkeys or simultaneous key presses can produceactions or executecomputer commands.