Armor

 is a series of equippable Defense items in Terraria, which reduce the amount of damage inflicted by Monsters and enemy players in PvP Mode. Each piece of armor has a Defense Rating, which reduces damage of each attack by an equal amount. However, an attack cannot be reduced to zero; all attacks will always deal at least 1 damage, regardless of the quality of a player's armor.

In addition to the Defense of each Armor piece, a complete set of Armor also confers a 'Set Bonus' when all three pieces of the same Armor type are worn at the same time. For the basic tier armor (Copper, Iron, Silver, and Gold) this is an additional bonus to Defense. For more unusual armor types, a different bonus is given.

While armor normally comes in three parts (A Helmet, a Chest Piece, and Legs) certain Accessory items, like Shackles, can also add to the player's overall Defense.