A studio audience is an audience present for the recording of all or part of a television program or radio program. The primary purpose of the studio audience is to provide applause and/or laughter to the program's soundtrack (as opposed to canned laughter).
In the United States, tickets to be a part of a studio audience are usually given away. However, as an enticement to attend, one or more members of the audience may be selected to win a prize, which is usually provided by a manufacturer in exchange for an advertisement, usually at the end of the show. Some game shows, such as Let's Make a Deal and The Price is Right, select contestants directly from the studio audience.
For sitcom/sketch comedy shows like All in the Family, Saturday Night Live and Happy Days (for indoor scenes), the use of a live studio audiences essentially turns them into de facto stage productions while shooting individual scenes, with minor problems like the audience applauding or uproariously whooping (the latter since becoming a satirical cliché in shows which mock the format and tropes of traditional sitcoms) when their favorite performers enter the stage. Shows like The Red Green Show, meanwhile, actually make the audience a part of the show, since that show is supposedly a television broadcast made from the (fictional) Possum Lodge, cast members react and speak directly to the audience as if they were talking to the viewers at home.