Napster is a music streaming service that allows users to listen to millions of songs on demand. The service was originally launched in 1999 as a peer-to-peer file sharing service, but was shut down in 2001 due to copyright infringement issues. In 2011, Napster was relaunched as a legal music streaming service, and was acquired by Rhapsody International in 2016. The service is available in over 30 countries, and offers both free and paid subscription options.