Editor's Note
As of June 2002, Napster is out of business. To find out more, check out CNN.com: Napster files for bankruptcy.
If you spend much time online, then you have most likely heard of Napster. What began in 1999 as an idea in the head of a teenager has redefined the Internet, the music industry and the way we all think about intellectual property.

In this edition of HowStuffWorks, you will learn what Napster is, what it does and how it works. You will also learn why there is so much concern, particularly in the music industry, about the issues of copyright and intellectual property.