An auction is a bidding process where a buyer offers a higher amount than the previous bid during a sale. The highest bidder becomes the buyer of the lot and is called the "adjudicator". Bids can be placed by the bidder in the room, by an absentee bid, over the phone, or online. Auction professionals are not allowed to bid for their own account, directly or indirectly, on lots presented in a sale in which they are involved.