Lighting is essential for filmmaking and requires both artistic skill and technical knowledge. There are several functions of lighting, including properly exposing the scene, conveying information about subjects, and setting the dramatic mood. Different lighting techniques are used to achieve these functions, such as key lighting as the main light, fill lighting to reduce shadows, and back lighting, kicker lighting, and rim lighting to separate subjects from the background. A thorough understanding of lighting theory and techniques is needed to effectively shape light and achieve the desired visual effects.