A silhouette is a dark shape or outline of an object or person that is visible against a lighter background. This effect occurs when light is directed from behind the subject, creating a stark contrast. Silhouettes are often used in art and photography to emphasize form and shape without revealing details. In design, silhouettes can convey mood and emotion, making them popular in various media, including film, advertising, and illustration. They can also be found in nature, such as the outline of trees against a sunset. Overall, silhouettes are a powerful visual tool that captures attention and evokes curiosity.