When looking to earn extra rewards at an online casino, consider the option to refer a friend. Many casinos offer referral programs where you can invite friends to join and receive bonuses in return. By referring a friend to a casino, you can both enjoy additional benefits such as bonus funds or free spins. This is a great way to share your gaming experience and potentially increase your winnings. Be sure to check the terms and conditions of the referral program to maximize the rewards for both you and your friend.