Add-on

Add-ons or expansions (also called expansion packs) are content created for games that is released separately from the main game release. Downloadable content (DLC) is a specific form of add-on distributed through the internet.

The first game in the Fallout series to feature downloadable content was Fallout 3, with a total of 5 add-on packs released. Fallout: New Vegas also features add-ons, with a current total of 4 pre-order bonuses and a single add-on pack.