3D films are movies that create the illusion of depth, making the images appear more lifelike. This effect is achieved by using two slightly different images, one for each eye, which the brain combines to perceive three dimensions. Viewers typically wear special 3D glasses to experience this enhanced visual effect. The technology behind 3D films has evolved over the years, with various methods like anaglyph and polarized light being used. Popular in genres like action and animation, 3D films aim to immerse audiences in the story, making them feel as if they are part of the action on screen.