What does the term "key light" refer to in video production?

The term "key light" refers to the main source of light for a scene in video production. It is the dominant light source that creates the overall illumination for the subject and establishes the mood and tone of the scene. The key light is essential for defining the subject's features and casting shadows, thereby contributing to the depth and dimension of the image.

In video production, the key light is typically positioned at an angle to the subject to create more dynamic lighting, enhancing the visual interest and emphasizing contours and textures. The placement and intensity of the key light can significantly affect how a scene is perceived, highlighting important elements while potentially leaving other areas in shadow.

Other types of lighting, such as fill lights or backlights, may be used in conjunction with the key light to balance illumination or create specific effects, but the key light remains the primary source for lighting the subject.