Your character’s equipment has durability; it will lose durability when you use it. You can repair it through the appropriate crafting profession, but it will never be returned to the level of durability it had when it was new. When your equipment loses all durability it is destroyed.

Your character’s equipment has durability; it will lose durability when you use it. You can repair it at a vendor, but the cost to do so is prohibitive. When your equipment loses all durability it is destroyed.

Your character’s equipment has durability; it will lose durability when you use it. You can repair it at a vendor, but the cost to do so is prohibitive. When your equipment loses all durability it cannot be used until repaired.

Your character’s equipment has durability; it will lose durability when you use it. You can repair it for a modest fee at a vendor. When your equipment loses all durability it cannot be used until repaired.

Your character’s equipment has durability. Nobody really knows why. Any meaningful effect on the game has been designed out; it is now, essentially, an inconvenience, a DOH! check at the start of each dungeon run.