Color gels are transparent sheets made from colored plastic or polyester that are used to change the color of light. They are commonly used in photography, theater, and stage lighting to create different moods or effects. By placing a color gel in front of a light source, the light emitted takes on the gel's color, allowing for creative lighting designs. These gels come in various colors and can be layered to produce new shades. They are often used in conjunction with lighting equipment like LED lights and floodlights. Color gels are an essential tool for lighting designers and photographers looking to enhance their visual presentations.