Soap film is a thin layer of liquid that forms when soap is mixed with water. It creates a colorful surface due to the interference of light waves reflecting off the film's two surfaces. The film is often seen in bubbles, which are spherical shapes that minimize surface area and energy. The properties of soap film are influenced by surface tension, which is the force that allows it to hold its shape. When light hits the film, it can create vibrant colors, making it a popular subject for scientific demonstrations and artistic displays. Soap films are also used in various applications, including cleaning and coating surfaces.