Final answer:
Three-point lighting is a technique that uses key light, backlighting, and fill lighting to achieve a well-lit and balanced subject in various visual arts, like theater, photography, and cinematography.
Step-by-step explanation:
The lighting style that uses three sources: a key light, backlighting, and fill lighting is known as Three-point lighting. This technique is employed to achieve a well-lit subject with a balanced look, avoiding harsh shadows and providing dimensionality in an image. For instance, in a theatrical setting, a lighting designer might use hidden fixtures to enhance the realistic appearance of a single light source, like a table lamp, to illuminate a scene. In photography and cinematography, backlighting is often used to create a silhouette effect by having the light source behind the subject, while key lighting provides the main illumination, and fill light mitigates the shadows created by the key light.