A Lifesteal server in Minecraft is a custom multiplayer survival mode where players gain an extra heart every time they kill another player and lose a heart when they die to one. This creates high-risk, high-reward PvP gameplay because health becomes a limited and valuable resource. As players collect more hearts, they become stronger and harder to defeat, while weaker players may form alliances to survive. If someone loses all their hearts, they are often banned or must be revived through special items, adding tension and long-term consequences. The mode is popular because it combines survival, strategy, politics, and intense combat into one competitive experience.