A theater prompter is a person who assists actors in their lines and cues during a theatrical performance. Synonyms for theater prompter include the term "cue caller," "prompter," or "line coach". These individuals are responsible for ensuring individuals on stage stay on track and deliver their performances with accuracy. Without their assistance, plays and other productions may suffer from missed cues, forgotten lines and a lack of cohesion between actors. To be a theater prompter requires a great deal of knowledge and expertise in the art of theater, as well as the ability to keep up with the pace of a live performance.