FOUNDATION is a product that can be used on its own to create a even finish. It can be used on a daily basis.
CONCEALER - can be used after a base of foundation has been applied to cover any blemishes or dark circles that are still visible.
BRONZER - can be used after a base of foundation has been applied to give yourself a nice tanned look.
ANTI - SHINE - can be used after all the above products have been applied or indeed if only one of the above has been used.