The D'Alembert strategy in Roulette is a betting system based on the concept of balancing wins and losses. It involves adjusting your bet size after each round: if you lose, you increase your next bet by one unit; if you win, you decrease your next bet by one unit. The goal is to achieve a break-even point over time by managing your bets in relation to previous outcomes. This strategy is often used for even-money bets, such as red/black or odd/even, and is considered less aggressive than systems like Martingale. However, while it aims to minimize losses and provide a more gradual approach to betting, it still carries risks and does not guarantee long-term success.