Freelance writers aren't the employee of any company. They work for themselves and sell their writing to anyone who wants to buy it. For instance, an automotive writer might write up a car review and then sell it to a number of news papers or magazines. They only get paid when somebody buys their article.
A freelance writer is someone who is self-employed and works for companies or other people based on a project or contract. There are various types of freelance writing varying from web, marketing to business depending on the content they are focused on.
I am a freelance writer, LOL. it's actually what miss orroco said. One thing, we don't have contract. We write just as if we want to, it's common especially when you're a student. Unlike the writers, they have their DEADLIEST line.