The Wither is a three-headed undead boss in Minecraft that can be summoned using 4 Soul Sand or Soul Soil and 3 Wither Skeleton Skulls. To summon it, arrange the Soul Sand or Soul Soil in a T-shape and place the skulls on top. The battle with the Wither consists of two phases: in Phase 1, it launches explosive skulls, and in Phase 2, it gains a blue shield and charges at the player. Players should prepare with Netherite or Diamond armor, potions, a Smite-enchanted sword, and milk buckets to counter the Wither effect. Defeating the Wither rewards players with a Nether Star and experience points. It is advised to avoid open areas during the battle and maintain constant movement to evade attacks.