A 3D film is a type of motion picture that creates the illusion of depth, making the images appear more lifelike. This effect is achieved by presenting two slightly different images to each eye, mimicking how humans perceive depth in the real world. Viewers typically wear special 3D glasses that filter these images, allowing the brain to combine them into a single three-dimensional picture. The technology behind 3D films has evolved over the years, with various methods such as anaglyphic, polarized, and digital 3D techniques. Popular in genres like action and animation, 3D films enhance the viewing experience by immersing audiences in the story and visuals.