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Experience points (XP) in Minecraft are used for enchanting tools, repairing gear, and utilizing anvils. XP can be obtained through mining, battling mobs, or by creating an XP farm, which allows for efficient experience accumulation. To create an XP farm, the following materials are needed: 4-6 stacks of building blocks, 2 water buckets, 4 hoppers, 4 chests, 1 hopper minecart (optional), slabs or trapdoors, torches, signs, and either a spawner or a dark room for natural spawning. The location for the farm should be a dungeon with a mob spawner or a high vantage point for a dark room. If using a spawner, clear a 9x9 area around it; for a dark room, build a spacious, enclosed platform in the sky. A collection system involves excavating a hole beneath the spawner or dark room, positioning water to guide mobs into a kill zone, integrating hoppers for loot collection, and installing a slab or trapdoor to prevent mob escape. Light control is important for spawning; keep torches in the spawner room until the farm is operational and ensure no light penetrates dark rooms. To farm XP, position yourself near the kill zone, allow mobs to accumulate, defeat them, and collect XP. If using a spawner, wait for mobs to spawn consistently and retrieve loot from the chests as needed.