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Stand-ins are helpful in the initial processes of production. Lighting setup can be a slow and tedious process; during this time the actor will often be somewhere else. Stand-ins allow the director of photography to light the set, the camera department to light and focus scenes. The director will often ask stand-ins to deliver the scene dialogue ("lines") and walk through ("blocking") the scenes to be filmed. In this way, a good stand-in can help speed up the day's production and is a necessary and valuable cast member on a film.
Stand-ins are distinguished from body doubles, who replace actors on camera from behind, in makeup, or during dangerous stunts. Stand-ins do not appear on camera. However, on some productions the jobs of stand-in and double may be done by the same person. In rare cases, a stand-in will appear on screen, sometimes as an in-joke. For instance, the actress who pretends to be Ann Darrow in the stage show during the final act of King Kong (2005) is played by Naomi Watts' stand-in, Julia Walshaw.
Stand-ins do not necessarily look like the actor, but they must have the same skin tone, hair color, height and build as the actor so that the lighting in a scene will be set up correctly. For example, if the lighting is set up with a stand-in shorter than an actor, the actor might end up having his or her head in relative darkness.
Stand-ins are also used for animated characters in a live action film, sometimes with life-size character models, so that the animators know where to place their animation and how to make them move realistically, and for actors to know where to look. In these cases, skin-tone and hair color are not so important. Height and build, however, are still important for any interactions between live action and animated characters.
Other usage 
In politics, a stand-in is a placeholder who occupies a seat until an appointment or election can be held to fill the seat.
There is a running Hungarian TV-show titled Beugró or Stand-in, based on improvising.
See also 
- Fake Shemp
- Political decoy
- John Bair
- The Stand In Seinfeld Episode
- Love Actually
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