Fanduel Stardust is a new feature that allows users to earn rewards by playing daily fantasy sports on the Fanduel platform. Users can accumulate Stardust points by participating in contests and completing challenges. These points can be redeemed for various rewards such as free contest entries, merchandise, and special experiences. Fanduel Stardust enhances the overall user experience by providing additional incentives and perks. It adds a gamified element to daily fantasy sports, making it more engaging and rewarding for players.