Key Types
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 Esc and Break – 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.
Read more about this topic: Keyboard Layout
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