Commercial broadcasting refers to the transmission of audio or video content for the purpose of generating revenue through advertising. It is the dominant form of broadcasting in many countries around the world. There are a number of synonyms for this term including advertising-supported broadcasting, for-profit broadcasting, and revenue-based broadcasting. Other terms that are commonly used to describe this type of broadcasting include commercial radio, commercial television, and commercial media. While there are many variations in the way that commercial broadcasting is practiced in different regions and contexts, it generally remains an important source of revenue for media companies and advertising agencies alike.