Keyboard

Physically, a keyboard is an agreement of rectangular buttons, or keys. A keyboard typically has characters stamped or printed on the keys; in most cases, each press of a key corresponds to a single written symbol. However, to produce some cryptogram requires pressing and holding several keys all together or in sequence; other keys do not produce any symbol, but instead affect the operation of the computer or the keyboard itself.

A majority of all keyboard keys produce letters, numbers or signs that are proper for the operator's language. Other keys can produce actions when pressed, and other actions are available by the real-time pressing of more than one action key.