Armor is an item in the Serious Sam series.
Armor is an item that the player can pickup. When the player has armor, a certain amount of damage is absorbed from each attack. The damage absorbed by the armor is taken from the player's current armor points. This makes it much more likely that the player will survive multiple attacks or one stronger attack than they would without armor.
If the player's armor count is reduced to zero, the player will start taking full damage from attacks again. They can regain armor points by simply picking up an armor item.
Armor is common throughout every Serious Sam game. Armor pickups that give a lot of armor points are rarer than ones that give less, and are often found in secrets.