What is armor save it warhammer 40000?

Answer 1

Armor Saves is the point value of a unit that allows it to deflect a wound, and not die. After a unit has been wounded, it throws and armor save role, if it has an armor 3+ for example, you would need to roll a 3, 4, 5, or 6 to save it from being killed.

Answer 2

When someone hits you with their weapon you roll a dice for your armour save such as 2+,3+,4+,5+ and 6+.

If they have instant death you don't get an armour save only an invulnerable save