1. There are auction houses in the four main cities of the Alliance: Stormwind, Ironforge Castle, Esoda and Danasus, and in the four main cities of the tribe: Orgrimmar, undercity, Silvermoon City and Thunder Cliff.
2. Auction house is a very important system in World of Warcraft. Unwanted equipment and materials can be sold to other players at the auction house, or you can buy what you need at the auction house.