An auction is an auction followed online or offline, and it depends on what kind of auction is it.

An online auction is where we place bids for the ongoing online auctions to buy that product with our highest placed bid compared to other submissions.

An offline bid work from the sound of the mouth where we raise our hands to place the bid; you may have seen offline bidding TV serials such as Storage Wars popular show for placing bids and participating in their play for placing bids.