Add-on

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

Fallout 3
The first game in the Fallout series to feature downloadable content was Fallout 3, with a total of five add-on packs released.
 * Operation: Anchorage (January 2009 for PC/Xbox, October for PS3)
 * The Pitt (March 2009 for PC/Xbox, October for PS3)
 * Broken Steel (May 2009 for PC/Xbox, September for PS3)
 * Point Lookout (June 2009 for PC/Xbox, October for PS3)
 * Mothership Zeta (August 2009 for PC/Xbox, October for PS3)

Fallout: New Vegas
Fallout: New Vegas has a total of four pre-order bonuses and six add-on packs. The pre-order bonuses were later condensed into the Courier's Stash add-on.
 * Dead Money (December 2010 for Xbox, February 2011 for PC/PS3)
 * Honest Hearts (May 2011 for PC/Xbox, June for PS3)
 * Old World Blues (July 2011)
 * Lonesome Road (September 2011)
 * Gun Runners' Arsenal (September 2011)
 * Courier's Stash (September 2011)

Fallout 4
Fallout 4 also features add-ons, with a total of seven add-on packs, of which two only include new settlement objects, and one is a graphical upgrade.
 * Automatron (March 2016)
 * Wasteland Workshop (April 2016)
 * Far Harbor (May 2016)
 * Contraptions Workshop (June 2016)
 * Vault-Tec Workshop (July 2016)
 * Nuka-World (August 2016)
 * High Resolution Texture Pack (February 2017, PC only)

Fallout 76
Add-ons in Fallout 76 are different from previous games and exist in the form of updates. Due to the online nature of the game, add-ons function as a series of updates spanning a certain period of time featuring new content. All of this content is free and is incorporated into the game. There are a total of six major updates.
 * Wild Appalachia (March–June 2019)
 * Nuclear Winter (June 2019-April 2020)
 * Wastelanders (April 2020)
 * The Legendary Run (June 2020)
 * One Wasteland For All (September 2020)
 * Steel Dawn (Winter 2020)

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