Why is it in the movies you have the main actors that speak but you have the other actors that don't really speak or interact with the main actors?

Titandragonfury
Are the background actors just there for scenery or do they actually have a part in the story plot?
I see that a lot in super hero movies where you have the back ground actors including women and men that don't really much throughout the movies.
Why is it in the movies you have the main actors that speak but you have the other actors that don't really speak or interact with the main actors?
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