PlayerWorlds is a Minecraft plugin that allows each player to create and manage their own private world with password protection. Players use /createworld to generate a personal world, and /joinworld to access it later. Each player can own only one world, and worlds are dynamically loaded when joined and automatically unloaded when empty to optimize server performance. The /lobby command returns players to the main world. All world data is saved persistently in worlds.yml, ensuring worlds remain accessible across server restarts.