Wowpedia:Interface customization

What are AddOns? How do I install AddOns?
AddOns are Lua/XML files that can modify the WoW User Interface. You can install an addon by extracting its folder(s) into the addons directory:

World of Warcraft\_retail_\Interface\AddOns

How do I develop AddOns? Where can I get AddOns?
Start with Create a WoW AddOn in under 15 Minutes. They can be downloaded from CurseForge and WoWInterface or one of the addon updater clients.

Interface documentation

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Interface customization

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