What term is used to describe the main performer or star in a film?

The term used to describe the main performer or star in a film is "Lead." The Lead actor or actress is typically the central character around whom the story revolves, often carrying significant emotional weight and screen time. This role is crucial in driving the narrative forward and is usually the most prominently advertised in promotional materials.

While supporting actors, character actors, and guest stars all play important roles in a film, they do not hold the central position that a lead does. Supporting actors typically have roles that complement the lead, character actors are often defined by versatility and the ability to portray varied characters rather than being typecast, and guest stars usually appear in a film or series for a limited time or in a special segment, often not carrying the narrative weight of the lead. Understanding these distinctions helps clarify the hierarchical structure of character roles in film.