Difference between VJ, anchor and host

[Daemon99]

Can someone please tell me the difference between VJ, anchor and host?
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Non-native speaker of English
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I intend to live forever - so far, so good.

[Mister Micawber]

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Briefly (from online dictionaries):

VJ (video journalist)-- a person who works as a reporter in television news broadcasting.

VJ (video jockey)-- One who announces, plays, and provides commentary on videotaped programs, especially music videos, as on television or at a discotheque.

Anchor-- a person who is the main broadcaster on a program of news, sports, etc., and who usually also serves as coordinator of all participating broadcasters during the program.

Host-- a master of ceremonies, moderator, or interviewer for a television or radio program.
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Native English teacher at Mister Micawber's