One of the things that sets this game apart from other MMOs is that Blizzard actively encourages players to use third party programs with their games. In short, Mods and addons help you legally manipulate the game to your advantage. They can either change the interface so you only have to deal with important information, or help automate and simplify some of the more difficult tasks you'll encounter.
To install an addon first download it to your computer. From there you must extract it to your Addons file which can usually be found in /c:program files/World of Warcraft/interface/Addons. From here you will have to log into the game and at the character select screen look for the small Addons button in the lower left side. Click on it to open up the addons menu and put a checkmark on the mod you wish to activate.
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