Dive lights are essential for underwater visibility, especially in low-light conditions or at depths where natural light is limited. They come in various styles, including handheld torches, head-mounted lights, and canister lights with separate battery packs. Dive lights should be waterproof, durable, and provide adequate illumination for underwater tasks. Features such as adjustable beam angles and varying brightness levels can enhance functionality. Regular maintenance, including battery checks and lens cleaning, is crucial to ensure reliable performance during dives.