Contouring is when you use a bronzer underneath your cheekbone to make it look higher and more defined. Highlighting i when you get a really light, sometimes shimmery colour and apply it to any bone on your face to make them stand out.
Overall, contouring and highlighting are just ways to make your face look thinner, if you have a round face, and make your bone structure look the way you want.
Here are a few examples Celebrities Contour & Highlight.
