The "Partner" tag on the Auctions page indicates that the domain name is provided by one of our partners and cross-listed from their platform:

You can place bids just as you would for any other auction and compete with other participants. If your bid wins, you'll receive an invoice once the domain is ready for purchase. After paying the invoice, the domain will appear in your account. The total cost will include the winning bid amount plus an additional fee.

Please note: Minimum bid amounts and bid increments for partnership auctions may differ from those used in standard auctions.

A bid increment is the amount automatically added to your bid during proxy bidding. You can find more information about standard bid increments here.