Soap film is a thin layer of liquid that forms when soap is mixed with water. It creates a colorful, shimmering surface due to the way light interacts with the film's varying thickness. This phenomenon is known as interference, where different wavelengths of light reflect off the front and back surfaces of the film, producing vibrant colors. Soap films are often used in science experiments and art. They can be shaped into bubbles or stretched across frames to demonstrate properties of surface tension and light. The study of soap films helps scientists understand fluid dynamics and the behavior of thin films in various applications.