RTP, or Return to Player, is a theoretical percentage indicating the amount of wagered money a slot game will return to players over time. Knowing the RTP of a slot game can be useful for understanding its potential payout rate. Many websites dedicated to online slots provide lists of RTP values for various games, allowing players to make informed decisions about which games to play. However, remember that RTP is an average over a long period, and short-term results can vary significantly.