In 3 point lighting, there are 3 different lights used on set for different purposes:
Fill Light - The primary lighting source for the scene, it is not aimed at anything in particular and is quite bright to illuminate the space.
Key Light - The key light is aimed directly at the subject of the shot to illuminate them specifically. It is more intense than the other lights.
Back Light - Positioned behind the subject to give them a "halo" effect to help define the subject from the background of the shot. It works particularly well on hair and skin.

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