Summary This online auction platform involves three roles: Seller, Bidder, and Admin. Sellers list products for auction, which are approved by Admin with a predefined time limit, starting price, and threshold amount. Bidders can place bids higher than the current maximum bid. The auction ends based on the seller's specified time and timezone, with the highest bid winning. If the highest bid is below the threshold, the product is marked as unsold and can be re-auctioned. Both Sellers and Bidders can provide feedback to each other.