Highlights is a general term that simply refers to hair that is lighter than the base color. Contrary to popular belief, highlights are not just for blondes, but can refer to lightening strands of any shade of hair. Highlights are traditionally applied using a method called “foiling,” in which sheets of foil are used to separate strands of hair that have been covered with a color or lightener before wrapping them in the foil to process. The foil keeps the lightener from getting on the surrounding hair, and also traps heat, allowing the lightener to lift more effectively. Foil highlights are generally placed close to the scalp, lightening the hair from the roots to the ends for an all-over highlighted look.