Other forms: broadcasters
A person whose job involves speaking on television, the radio, or online is a broadcaster. Your favorite TV meteorologist is a broadcaster, and so is the DJ with the jazz show your grandpa loves.
A broadcaster is someone who broadcasts, or transmits information. This can mean reading the evening news for an internet streaming station or narrating a high school basketball game for a local radio station. Another meaning of broadcast is "scatter seed widely," and for a farmer, a broadcaster is a machine (or person) that does the job. The seed meaning is older; the media definition comes from the idea of spreading information widely.