what is a newscast

WHO
www.wikianswers.com
First TV Newscaster, Kolin Hager, broadcasted farm and weather reports three times weekly on W2XB (May 10, 1928, USA)A newscaster is a presenter of a news bulletin who is himself or herself a working journalist and news gatherer as well as a participant in compiling the script to be delivered in a news bulletin.Prior to the television era, radio-news broadcasts often mixed news with opinion and each presenter strove for a distinctive style. These presenters were referred to as commentators. The last remaining news presenter of this type is Paul Harvey. The term newscaster came into common use to distinguish presenters of straight news broadcasts from commentators.
WHAT
http://www.wikipedia.com/
Newscast is the broadcasting of various news events and other information via television or radio. The content is usually either produced locally in a newsroom, or by a broadcast network. It may also include such additional material as sports coverage, weather forecasts, traffic reports, commentary and other material that the broadcaster feels is relevant to their audience.
When
http://tarlton.law.utexas.edu/lpop/tv/tvhistory.html
First TV Newscaster, Kolin Hager, broadcasted farm and weather reports three times weekly on W2XB (May 10, 1928, USA)CBS begins experimental television brodcasting . (1931)Where Newscasting is generaly done in building owned by a televison company there are many of these all over the world.
Why
Newscast are used to get informatino to across the whole world so we know what is going on around the world with out going to that perticular place.
How
a news cast is done generaly recording news and then brodcasting it on the television.

E.X.
http://www.youtube.com/watch?v=THfiHQZVSw0