Last.fm is an internet radio and music community site founded in 2002 in the UK that allows users to listen to free music streaming radio based on their music tastes. Users can create a personalized radio station by entering an artist and Last.fm will generate a playlist of similar music based on the tastes of other users. It offers features like custom profiles, adding friends to find new music through their stations. Last.fm hosts a wide variety of musical genres and popular artists but does not always have every track available and requires a profile and payment for some features.