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A keyboard layout is any specific mechanical, visual, or functional arrangement of the keys, legends, or key-meaning associations (respectively) of a computer, typewriter, or other typographic keyboard.
Most computer keyboards are designed to send scancodes to the operating system, rather than directly sending characters.
It is usually possible for an advanced user to change keyboard operation, and third-party software is available to modify or extend keyboard functionality.
A computer keyboard comprises alphanumeric or character keys for typing, modifier keys for altering the functions of other keys, navigation keys for moving the text cursor on the screen, function keys and system command keys – such as – for special actions, and often a numeric keypad to facilitate calculations.
There is some variation between different keyboard models in the mechanical layout – i.e., how many keys there are and how they are positioned on the keyboard.
However, differences between national layouts are mostly due to different selections and placements of symbols on the character keys.
In many other languages there are additional letters (often with diacritics) or symbols, which also need to be available on the keyboard.