When you watch a movie, it appears as if the images on the screen are moving smoothly. In fact, the movie is produced by a series of still photographs that are projected on the screen. You perceive the images as moving smoothly rather than as a jerky series of images because of:

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Quizplus · Accepted Answer

The smooth appearance of moving images in a movie is due to stroboscopic motion. The film is actually a sequence of still frames that are projected at a rate fast enough to create the illusion of motion. This is similar to how a stroboscope creates the illusion of a moving object by flashing a sequence of still images.

When You Watch a Movie, It Appears as If the Images