Community theatre refers to theatrical performance made in relation to particular communities
I've heard of community theaters before. Are they typically for people who aren't professional actors to perform?
That's for Amateur theatre, also known as amateur dramatics, is theatre performed by amateur actors
Okay. That makes sense. What kinds of shows do community theaters put on?
Community shows! , They are a non-profit businesses with a large active membership and, often, a full-time professional staff.
That's a great service they provide to the community then, if they're usually non-profits. Are there any particularly famous community theaters? Or any major actors that got their start there?
Not sure! But Community arts, also sometimes known as "dialogical art", "community-engaged" or "community-based art," 
Community arts and theater sound like really valuable programs for communities. It's important to support civic arts. 
Yeah similar,community-based art," refers to artistic activity based in a community setting.