Keepers are market participants who assist AUSD in maintaining its Target Price ($1) by selling AUSD when the market price is above the Target Price and buying AUSD when the market price is below the Target Price in the ADADAO Protocol. When ADADAO Vaults are liquidated, Keepers engage in Surplus Auctions, Debt Auctions, and Collateral Auctions. Keepers can be individuals trying to do arbitrage or they can be arbitrage bots doing the same task.