A journalist is a person whose job involves writing nonfiction stories for newspapers, magazines, or online news sites. If you are reading or hearing a news story, you have a journalist to thank for providing that story.
One type of journalist is a reporter, who researches topics and interviews people before writing a story or producing a piece for TV. Editors, photographers, and columnists can also be described as journalists, particularly if they work for a newspaper. Another kind of journalist is a person who regularly writes in a journal or diary. Journalist comes from the Old French jornel, "day" or "day's work," which became journal, "daily publication."