From the back of the core rule book: "Savage Worlds is a Fast! Furious! and Fun! rules system for any genre of roleplaying game! Create your own setting, convert an existing one, or pick up on of our amazing worlds like Deadlands, Slipstream, or Sundered Skies.
The rules are designed to give players plenty of depth when creating characters, while keeping bookkeeping to a minimum for the Game Master.
If you're looking for a game that's fast and easy to set up, run and play, Savage Worlds is for you!"
As a boardgame:
Savage Worlds can also be played strictly as a miniatures game, and thus also exists as a BGG boardgame entry.