Downloadable content

Downloadable content (DLC) is a content distributed through the internet and created for a game that is released separately from the main game release, can adding new game areas, weapons, items, and/or extended the storyline.

Deus Ex: Human Revolution
The first game in the Deus Ex series to feature downloadable content was Deus Ex: Human Revolution, with a current total of 2 pre-order bonuses and one add-on to come (release date is October 2011 on all platforms):
 * The Missing Link