1). Function key - Used to activate the second function of a dual-purpose key.
2). Special key - Not a part of traditional keys and works for multimedia purposes.
3).command key - Found of Apple keyboard and is part of shortcuts, same as a control key on windows
4). Navigation key - Keys that are used to move the pages or selected objects in up, down, right, or left direction.
5). Alphabet key - Used to input alphabets and also part of some shortcuts.
6). Numeric key - Used to input numerals