Highlights
Strands lightened, or darkened in lowlights, against the rest of the hair to add depth.
Also: foils, lowlights
Highlights are fine or chunky strands of hair lightened to stand out from the base colour. The traditional method weaves sections out with a comb and wraps them in foil while the lightener works, so that colour does not touch the hair around them. Lowlights are the reverse, adding darker strands. Babylights are very fine highlights that look like a child's sun-lightened hair. They are a common way to brighten hair without colouring it all.