Highlighter makeup is pale, shimmery powder or cream makeup that's meant to mimic the effects of really good lighting on skin. It makes cheekbones pop, eyes shine and skin glimmer. It's not an essential part of your look like, say, concealer or mascara, but much like a bit of eye-catching jewelry, it's a fun, flattering addition to your look. Traditionally, highlighter is a powder, but the rise of new, easy-to use gel formulas have made it as easy as finger paint to apply and the effect as natural or spotlight stealing as you want it.