A presenter, host, or hostess, is a person or organization responsible for the running of a public event. A museum or university, for example, may be the presenter or host of an exhibit. In films, a presenter (but not a host) is a usually a well-known executive producer credited with introducing a film or filmmaker to a larger audience. For example: “Presented by Cecil B. DeMille”. In the broadcast media a presenter is in British and Commonwealth English, the person who hosts, narrates, or otherwise takes the main role in narrating or hosting a radio program or a TV program. The phrases “TV presenter” or “radio presenter” are never used in American English, and rarely in Canada. A person who hosts other kinds of public entertainments may also be called a “master of ceremonies” (often abbreviated “M.C.” or “emcee”).