In
computing, a keyboard
is a typewriter-style device, which uses an arrangement of buttons or
keys, to act as mechanical levers or electronic switches. Following
the decline of punch cards and paper tape, interaction via
teleprinter-style keyboards became the main input device for
computers.
A
keyboard typically has characters engraved or printed on the keys and
each press of a key typically corresponds to a single written symbol.
However, to produce some symbols requires pressing and holding
several keys simultaneously or in sequence. While most keyboard keys
produce letters, numbers or signs (characters), other keys or
simultaneous key presses can produce actions or execute computer
commands.
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