An online auction application is a platform that allows users to bid on items in real-time via the internet. It facilitates bidding by displaying auction items, managing bids, and updating users with the latest status. Users can place bids, monitor competitors, and win items based on the highest bid or auction rules. These platforms often include features like automated bidding, reserve prices, and real-time notifications. For example, if you're bidding on a rare collectible, the app will track your highest bid, notify you of competing offers, and finalize the sale if your bid is the highest by the auction's end.