Armour is protective clothing intended to defend its wearer from intentional harm in combat and military engagements, typically associated with soldiers. Armour has been used throughout recorded history, beginning with hides, leather, and bone, before progressing to bronze, then steel during the Middle Ages, to modern fabrics such as Kevlar, Dyneema and ceramics.
Armour (or armor) in animals is external or superficial protection against attack by predators, formed as part of the body (rather than the behavioural use of protective external objects), usually through the hardening of body tissues, outgrowths or secretions. It has therefore mostly developed in 'prey' species. Armoured structures are usually composed of hardened mineral deposits, chitin, bone or keratin.