Peer-to-peer file sharing, or P2P, means the sharing of files between two users on the Internet. Gnutella, KaZaA, Napster, iMesh, LimeWire, Morpheus, SwapNut, WinMX, AudioGalaxy, Blubster, eDonkey and BearShare are some of the more popular programs that have been used for P2P file sharing.

These allow users to specify files located on their computers that can be freely shared with other users, as well as allow a user to download any shared file from another user's computer. These P2P programs are most often used to share music, software, and videos over the Internet. This type of sharing by creating multiple copies of a copyrighted work is illegal, and there are many dangers associated with P2P.