Blizzard releases many localized versions of the World of Warcraft client, each version translating the game to a particular language. Players in some regions may also install additional language packs, allowing them to play World of Warcraft in a desired language. Depending on the functionality they provide to the player, addons may need to be internationalized in order to work on clients that use a different locale than the addon author's, and localized in order to present themselves to the user in the user's desired language.