In film, video production, animation, and related fields, a frame is one of the many still images which compose the complete moving picture. Historically, these were recorded on a long strip of photographic film, and each image looked rather like a framed picture when examined individually, hence the name.
When the moving picture is displayed, each frame is flashed on a screen for a short time (nowadays, usually 1/24th or 1/30th of a second) and then immediately replaced by the next one. Persistence of vision blends the frames together, producing the illusion of a moving image.
Film gauge is the size and dimension of the filmframe.
With respect to closed/open frame, the frame can be composed to create a real feeling of openness by having the character in the middle of the frame and having nothing on either edge.
Sometimes the frame can be composed to create an effect of internal framing, where a character is framed by, for example, a doorway or window; this creates a frame within a frame and tends to emphasize the character, drawing our attention particularly to him or her.
After the film is developed at the laboratory, it is slit down the middle and the pieces are spliced together, resulting in an 8mm film.
The film itself comes either wound tightly around a plastic `core,' for loading into a camera magazine (either in a darkroom, or a portable `changing bag'), or, for 100' and 200' lengths, mounted on small metal spools (like those for regular 8mm), which can be loaded into the camera in moderately bright daylight.
Films shot in 16mm almost always run at 24 frames per second (fps), with the exception of many silent home movies which are sometimes shot at 16 fps.