File sharing is the practice of distributing or providing access to digitally stored information, such as computer programs, multi-media (audio, video), documents, or electronic books. It may be implemented through a variety of storage, transmission, and distribution models and common methods of file sharing incorporate manual sharing using removable media, centralized computer file server installations on computer networks, World Wide Web-based hyperlinked documents, and the use of distributed peer-to-peer (P2P) networking.
File sharing is not in and of itself illegal. However, the increasing popularity of the mp3 music format in the late 1990s led to the release and growth of Napster and other software that aided the sharing of electronic files. This in practice led to a huge growth in illegal file sharing: the sharing of copyright protected files without authorization.
Although the original Napster service was shut down by court order, it paved the way for decentralized peer-to-peer file sharing networks such as Gnutella, Gnutella2, eDonkey2000, the Kazaa network, and Bit*******.
Starting in the early 2000s, some file sharing networks and services — including the original incarnations of MP3.com, Audiogalaxy, Napster, and Morpheus — were accused of facilitating illegal file sharing and were shut down due to litigation by groups such as the RIAA and MPAA. During the same period, the fight against sharing also expanded into lawsuits against individual users of file sharing software.
The economic impact of illegal file sharing on media industries is disputed. Some studies conclude that unauthorized downloading of movies, music and software is unequivocally damaging the economy, while other studies suggest file sharing is not the primary cause of declines in sales. Illegal file sharing remains widespread, with mixed public opinion about the morality of the practice.