In photography, Silhouette refers to as Contre-jour, French word for 'against daylight ~ it refers to the sight or image of a person, object or scene that is backlit, and appears dark against a lighter background. This effect usually hides details, causes a stronger contrast between light and dark, creates silhouettes and emphasizes lines and shapes. The sun, or other light source, is often seen as either a bright spot or as a strong glare behind the subject. Additionally, the word silhouette is an eponym of Etienne de Silhouette, a French finance minister who in 1759 enjoyed making cut paper portraits.
I have taken quite a few of Silhouette. Don't hesitate to photograph an image just because you're directly facing the sun and that your subject is pitch-black, you'll be surprised that you will produce one.
Photography brings an inspiring awe to me ~ just like the photographer above who wants to capture the Sunset in Mona Kea Hawaii and the surfer below in his Post Surf Awe.