The auto-relist features is much as it sounds. If you select this feature, your auction will automatically be relisted when the auction ends. If you want the auction to relist even if the items is sold, select "yes" for the second auto-relist option (auto relist even if sold). If you want the auction to relist only if the item is not sold, select "no" for the second option. In the third option, you can specify how many times you want the auction to auto-relist (up to 5 times).