Auction   Auction - a system of trade for real money between players. You can buy an item that you recently tried to get but didn't succeeded. Or you can sell all not needed stuff for real money, or put to auction an expensive thing for you, because of a greedy dwarf sitting inside of you.    To participate in the bidding at the auction you should have Euro on the balance of your MA. How to get Euro: http://l2classic.club/forum/index.php?/topic/2955-how-to-donate