Editing Video game modding (section)

===Add-on===
{{Unreferenced section|date=January 2011}}
An ''add-on'' or ''addon'' is a typically small mod which adds to the original content of a specific game. In most cases, an add-on will add one particular element to a game, such as a new weapon in a shooting game, a new unit or map in a strategy game, a new vehicle or track in a racing game, items in a game like ''[[Minecraft]]'' or ''[[Terraria]]'', or additional content in simulation games (such as new pilotable airplanes, e.g., the [[Airbus A330]] or [[Boeing 787 Dreamliner]]). An example of a mod that adds functionality to augment or enhance a players experience is ComputerCraft, a [[Minecraft modding|Minecraft mod]] that adds programmable computers and robots to allow the player to automate tasks in-game. This can be accomplished without changing any of the original game's existing content. Many games are flexible and allow this, however that is not always the case. Some add-ons occasionally have to replace in-game content, due to the nature of a peculiar game engine. It may be the case, for example, that in a game which does not give a player the option to choose their character, modders wishing to add another player model will simply have to overwrite the old one. A famous example of this type of mod can be found for the ''[[Grand Theft Auto]]'' series wherein modders may use downloadable tools to replace content (such as models) in the game's directory. The ''[[Left 4 Dead]]'' series can also be modded with individual add-ons which are stored in a {{Not a typo|.VPK}} format, so that a player may choose to activate a given mod or not.