BitTorrent is two things: a method for transfering large files efficiently to many people at once, and a the name of a program that uses this method. BitTorrent is especially good at allowing someone to “publish” a really big file—an application, a video, a large chunk of data—and deliver it to thousands or even millions of people without having enormous bandwidth costs. So, while some people use it for digital piracy, others are already using it for education, for news reporting, or for distributing important software updates.