File sharing programs are used to transfer files (video, audio, pictures, ...) usually using peer to peer (P2P) network protocol like Gnutella, Freenet, FastTrack or other. In a normal peer to peer network there are no servers or clients, there are only nodes that functions like clients and servers at the same time, so while you downloading, somebody other can at the same time download from you. There are many free file sharing programs so choose the one that suits your needs.
