What is a toner?
A toner is a product which is used to remove any oiliness from the skin. It can be called an astringent, it can be called a tonic, or it can be called a toner. It shouldn't be, ideally, containing any alcohol, which will dry the skin. Even an oily skin doesn't need alcohol. It makes it too dehydrated. The toner should be applied on a damp cotton ball, wiped over the skin to lift off and remove any oiliness, any traces of cleanser which are left behind, any minute amounts of makeup which the cleanser hasn't properly removed, or dust and dirt from the atmosphere.