Silhouette is the image of anything presented as a solid shape of a single color – mostly black. Silhouette lays emphasizes on the outline of the object. Below is a silhouette of a bird sitting on a roof top.
The word is derived from the name of a French finance Minister Étienne de Silhouette. In 1759, the minister imposed several austerity measures that made his name synonymous with a basic detail-less solid color art work. Though in the modern times we see silhouettes in photography, these were originally carved out from black card boards and mounted with a white background.
Below is a shot of the same still with minor details showing up.