Sunlight is the natural light that comes from the sun. It is composed of both visible and invisible RAYS, including ultraviolet and infrared radiation. DAYLIGHT is a term used to describe the illumination of the sky during the day, which is caused by sunlight reflecting off the Earth's surface. RAYS are beams of light that travel in straight lines. Sunlight is composed of many different types of RAYS, including visible light, infrared, and ultraviolet.