Ever come across an M3U file when downloading music? From the M3U Wikipedia page:

M3U is a computer file format that stores multimedia playlists. It is supported by many applications, including media players such as Windows Media Player, iTunes, Winamp, Audacious, foobar2000, Totem, JuK and VLC media player on Windows PC’s and Astro Player, N7Player, Cubed on Android OS devices. M3U’s can also point a media player to an online streaming audio source.

Follow the headline link and learn what’s in an M3U file, how to play it in iTunes, and how to get the songs referenced by the M3U file onto your Mac. Good stuff.