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.
The main, alphanumeric portion is typically stable, while symbol keys and shifted key values change somewhat, modifier keys more so, and function keys most of all: QWERTY dates to the No.
1 (1874) (though 1 and 0 were added later), shifted keys date in some cases to the No.
1), the first commercially successful typewriter, which introduced QWERTY; its successor, the Remington No.