Information displays Allow at-a-glance access to information like durability, current wealth, location of current quest objective, combat stats, etc. Boss mods Provide timers and warnings for boss encounters. Action bars Provide additional ways to trigger your class abilities. Unit Frame addons Customize how your, your party's, or your raid group's health/mana/debuffs/buffs are displayed, and allow you to target specific players. There are several broad categories of functionality provided by addons: In particular, addons must be available free of charge, and may not include advertisements or solicit donations in-game. With the release of Patch 3.1, Blizzard introduced an official UI Add-On Development Policy that limits how addon authors can distribute their addons. Collections of addons that have been put together to form a coherent user interface are sometimes referred to as UIs. Some addons are standalone, and are able to run without any additional addons being installed others can require certain other addons to be installed to work at all, or integrate with other addons to provide additional functionality. by changing colors or positions of UI elements) without changing its functionality, or even replace the default UI entirely. additional buttons you can press to do things), modify the default UI's appearance (e.g. Addons vary greatly in scope and size - they may display information not presented at all by the default UI, add functionality to the default UI (e.g. AddOns (sometimes called addons, add-ons, or mods) are collections of Lua/ XML code that augment, modify, or replace World of Warcraft's default user interface.

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