Peer-to-peer file sharing - Wikipedia, the free encyclopedia: "The first generation of P2P software is Napster, a central server-based model that was eventually shut down. The second generation of P2P software is Gnutella and Kazaa, which are user-based models. BitTorrent became the third generation of P2P networks. The difference between BitTorrent and previous generations is that it creates a new network for every set of files instead of trying to create one big network of files using SuperNodes, web caches or servers.
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