Kazaa Media Desktop (once capitalized as "KaZaA", but now usually written "Kazaa")'s a peer-to-peer file sharing application using the FastTrack protocol and owned by Sharman Networks. Kazaa's commonly used to exchange MP3 music files over the Internet. However it can also be used to exchange other file types, such as videos, applications, and documents. The official Kazaa client can be downloaded free of charge; however, it 's bundled with adware and spyware, even though there're "No spyware"… (More on Kazaa)