Discourse Community
A group with shared knowledge, values, characteristics, genres, languages, and/or style.
General Audience
A general audience consists of the public or laypeople who are not members of your field and who have general knowledge about topics but not specific knowledge.
At its most basic level, rhetoric is the study of how we communicate effectively with people. It encompasses a study of the tools we might use as well as the way the context of our communication may impact the way we use those tools.