Mending is an enchantment that restores durability of an item using experience.

How do you use mending in Minecraft?

Mending can be applied by using an enchanted book. This can be used on an object by placing down an anvil, putting the item in one slot and the book in the other. The item should then come out enchanted.

What does me mending do in Minecraft?

The Mending enchantment uses xp (experience) to mend your equipped tools, weapons and armor. Each time you gain experience by killing mobs or mining certain items, the experience earned will automatically be used to repair any damaged tools, weapons or armor that you have equipped (and are enchanted with Mending).