Final answer:
Contouring is a makeup technique that uses a darker product to create shadows over prominent features so they are less noticeable.
Step-by-step explanation:
A contour is formed when a product that is darker than the client's skin tone is used to create shadows over prominent features so they are less noticeable. Contouring is a makeup technique that is commonly used to shape and define the face. It involves using a product, such as a dark shade of foundation or powder, to create shadows in areas like the hollows of the cheeks, along the jawline, and on the sides of the nose. By strategically placing darker shades, the contours of the face can be altered, making certain features appear more prominent or less noticeable.