What is Armour
Armor is a stat that is shared by all units (infantry, vehicles, special units and air units). Each unit class has a different armour type that reacts differently to the various attack types. Each units has an armour stat and this could be enhanced in several ways - with deployment, passive or active abilities and with auras.
Damage reduction is the amount of damage that is being reduced by an armour type. Each type of armor has a predefined amount of damage reduction in percentages. As an example - if an anti-personnel attack has a damage of 100 points. Heavy armor has a 90% damage reduction from anti-personnel attacks. This means that a unit with heavy armor will take 10% out of the 100 damage if attacked with an anti-personnel attack.