A performer that has no lines to say. Usually in the background, but might have a more prominent place in the scene. In this book I use film, shoot, and tape more or less interchangeably, because I'm not always sure which term is the most appropriate for a particular situation. To film a scene means to record the scene on film. This technique is used for feature films.
Some TV shows film and some tape, and many use a combination of the two.
Shoot is a generic term that can apply to filming or taping. First AD First Assistant Director. The director is in charge of coordinating all of the efforts of everyone involved in the actual filming of a movie or a television show. The first assistant director is the number two person and reports directly to the director. Grip Crew member responsible for labor, such as building sets, moving equipment, and any labor that needs to be performed.