Unless your character has access to magical powers, weapons are how you deal damage. There are many different kinds of melee and ranged weapons. While most weapons require some amount of training to use well, almost anyone can pick up a weapon and attempt to use it to deal damage to another creature.
Like all tools, weapons may be crafted as a masterwork or infused with magic to increase their damage and accuracy, and to give them additional magical properties. An enhanced weapon’s enhancement bonus is added to both the weapon’s attack and damage rolls.