In cash games, bankroll management focuses on ensuring you have enough funds to withstand variance over an extended period, typically by playing at stakes where you have 20-40 buy-ins. This helps you avoid going broke due to short-term fluctuations, as the structure of cash games means you can lose individual hands but not your entire stack in one go. In tournaments, the risk is higher because your stack is tournament-specific, and losing it means elimination. Therefore, bankroll management in tournaments generally involves having 100-200 buy-ins for the stakes you're playing to protect against long stretches of bad luck, as you might not cash in every event. Both require discipline in choosing appropriate stakes to avoid putting your entire bankroll at risk, but tournaments demand more buffer due to the potential for multiple buy-ins over time.