What is gel in drama?

A gel in drama or film is a transparent or translucent plastic sheet that is placed in front of a light to create a colored or textured pattern of light. This is usually used to create different colored lighting effects, such as sunlight or moonlight, and to create shadows. Gels can be made from different materials, such as dyed acetate or colored cellophane, and come in a wide range of colors and patterns. They can also be manipulated by crumpling or cutting to create different patterns and effects.