The flicker effect refers to the visual phenomenon where a rapid and repeated change in light intensity creates the illusion of movement or flashing. This effect is often seen in movies, television shows, and video games, where a series of still images are displayed at a high speed to create the illusion of motion. It can also occur in natural settings, such as when sunlight filters through leaves or when a fire flickers. The flicker effect can be used to add excitement and intensity to visual media, but it can also cause discomfort and even seizures in some individuals.