Keyboard

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.