Mod:Modification

A mod is the abbreviated name for "modification", and describes any alterations made to a game. Mods are typically created by fans and players of the series to either add new content, modify existing content in the game, or both. There are many different types of mods, aimed at: re-balance, making items or NPCs either more or less powerful; re-texture, to enhance\change graphics; add new weapons, NPCs, quests, clothing, faces, buildings, etc

Fallout and Fallout 2
Although not designed to support modding, the game's engine loads loose files found in the game's directory, allowing for players to modify the game. Over the past two decades, both games have been reverse-engineered and accrued a number of notable modifications, including support for higher resolutions, engine upgrades, and of course, restoration of cut content.

Notable mods include:
 * Fallout Fixt, which incorporates high resolution patches, engine updates, and a plethora of other modifications.
 * Fallout 2 Unofficial Patch and Restoration Pack, which fix almost every bug in the game and restore a tremendous amount of cut, bugged, or otherwise planned, but never finalized content respectively.

Fallout Tactics
The game was released with official modding support and a complex game editor allowing for editing everything from item and character statistics, through maps, to creating entire campaigns. It experienced limited popularity.

Fallout 3
To facilitate modding of Fallout 3, Bethesda released the GECK editor.

Fallout: New Vegas
Modding of Fallout: New Vegas is also done using the GECK although the versions between it and the editor used for Fallout 3 vary slightly.

Fallout 4
With the introduction of the Creation Engine in Fallout 4, Bethesda released the Creation Kit as the official modding tool for the game. The addition of the Creation Club allowed for commercial releases of mods after approval and testing by Bethesda.

Fallout 76
Fallout 76 does not officially support any modding at the present. Due to the online nature of the game, modifying the game's content in any way can be interpreted as cheating by the server and result in an account-wide ban, though said ban can be appealed and redacted.