What do enchanted books do in Minecraft?

An enchantment table uses your level points to enchant armor and weapons. You put an item in, and you can enchant it using your points earned from killing monsters and things. Some examples of enchatments are unbreaking and efficiency. Helpful tip: if you surround your enchantment table with bookselves (maybe 2 boxes tall) you can get higher enchantment levels for stronger weapons/armor.