WH_KEYBOARD vs. WH_KEYBOARD_LL

I read that WH_KEYBOARD_LL is for "Low Level" keyboard hooks.
Does this mean that if you wanted to hook _all_ keys recieved from the user, then you'd need to use this? Whereas WH_KEYBOARD is just for a specific application?

Or, can WH_KEYBOARD be used to hook the keyboard, as to recieve _all_ keys pressed?

Thanks.