Presenter
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".
Broadcast media
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 television program. The phrases "television 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").
Television presenter
A television presenter is a person who introduces or hosts television programmes, including factual documentaries, live events and sport. Nowadays it is common for minor celebrities in other fields to take on this role, but there are also a number of people who have made their name solely within the field of presenting, particularly within children's television series to become a television personality.