1. A silhouette is an outline of an object with no internal details, usually appearing black against a brighter background due to backlighting from a light source like the sun. 2. To capture a silhouette, the object must be placed directly in front of the light source so it blocks the light. Too many light sources or a background that reflects light can wash out the silhouette effect. 3. Any object can be used for a silhouette as long as it can be backlit, like holding up a fish or photographing under a swimming fish to capture its silhouette against the sunlight filling the water.