An axe is a one-handed weapon that is held in the main hand in Kingdom Come: Deliverance. It consists of a short wood or metal shaft with a metal head that is blunt on one side and sharpened into a blade on the other. It was both used as a tree-choping tool and as a war weapon.
Axes are very powerful, and they deal very high slash and blunt damage. Against unarmoured targets, they will inflict the highest damage output - out of all other weapon categories of the same level requirement category.
Due to the nature of split damage and split damage resistance, axes excel at dealing with enemies that are less heavily armoured, or not armoured at all, and they're overall built for versatility.
Because of this, you should beware enemies that use axes if you opt to wearing less (or overall lighter) armour, as these weapons will inflict incredible amounts of damage. The same works in your favour however.
Most axes lack a spike, but having one, especially for enemies that lack face-covering helmets is a rather valuable commodity.