Break down film acting into the four basic categories and briefly explain each

What will be an ideal response?

Answer: The ideal answer should include:
1. Extras. These actors are used primarily to provide a sense of a crowd—as in “a cast of thousands.” Players of this type are used as camera material, like a landscape or a set.
2. Nonprofessional performers. These are amateur players who are chosen not because of their acting ability, which can be negligible, but because of their authentic appearance—they look right for a given part.
3. Trained professionals. These stage and screen performers are capable of playing a variety of roles in a variety of styles. The majority of actors fall into this category.
4. Stars. These are famous performers who are widely recognized by the public. Their drawing power is one of the main attractions of a film or stage play. The star system was developed and has been dominated by the American cinema, though it’s hardly unique to movies. Virtually all the performing arts—opera, dance, live theater, television, concert music—have exploited the box-office popularity of a charismatic performer.