What do you call someone who writes for newspaper or magazines or who broadcasts on radio and televisions?

There are a number of people who write for a newspaper. Some are called "reporters" and they go out to cover breaking news; they then write the stories about it. Some people refer to reporters as "journalists"-- this is a general term for anyone who covers the news. Some people at the newspaper are called "columnists" or "opinion writers," and they write commentary about current issues; they may even comment about news stories in their own newspaper. Newspapers also have "stringers" or "free-lancers"-- these are reporters who don't work for the newspaper but are called in on an as-needed basis to cover certain stories and help the regular reporters.