Durability

Durability is a property which all Tools, Armor and some usable weapons are subject to. It is the representation of how many useful actions an item has performed.

Armor
Armor Durability is taken away when the Player takes damage which that Armor is capable of reducing. This includes:
 * Attacks from mobs and other players,
 * Touching a block of Fire, Lava, or Cacti
 * Explosions
 * The Thorns Enchantment

Tools
When tools are used for their intended purpose, 1 durability is taken away. In some cases, using them incorrectly can result in extra durability being taken away.

Different tier of tools have different durabilities:
 * Gold - 33 uses
 * Wood - 60 uses
 * Stone - 132 uses
 * Iron - 251 uses
 * Diamond - 1562 uses

Other miscellaneous tools also have durability:
 * Fishing rods - 65 uses
 * Flint and steel - 65 uses
 * Shears - 238 uses
 * Bow - 385 uses
 * Elytra - 432 uses

Repairing
Once Classic Crafting is added in Update 1.0, items can be repaired. This process can be done by placing two damaged items of the same kind in a Crafting Table together. This will combine the items and give one item with their combined durabilities and an extra 5% durability.

Trivia

 * Before Update 1.0, Items could not be repaired and would inevitably break after their durability was exhausted.