Web: Discover is Spotify's new approach to music discovery. While Spotify's radio feature already tries to suggest bands and artists based on the ones you like, Discover suggests new music to you based on the people you follow. Your recommendations will be packed with playlists, songs, and artists your friends enjoy that you may not have tried.
Spotify has one of the web's biggest databases of streaming music, and while it's always had things like shared playlists and the ability to see what your friends are listening to, Discover is a more direct take on music discovery. It takes things a step further and tries to combine truly useful suggestions with playlists and artists that your friends have recently enjoyed.
If you're worried that you'll get stuck with a bunch of suggestions you'll hate because you and your friends have different tastes in music, don't worry: Spotify says that the recommendations you'll see take a range of things into consideration, not just what your friends are listening to. To try Discover, head over to Spotify's web player -- it's only available on the web right now (partially because it's supposed to replace Spotify's home page eventually) and will make its way to the desktop and mobile apps soon.