Monster in DnD
In the game of DnD, you will have to fight monsters or NPCs (Non Player Characters). These adversaries are controlled by the DM and have similar stats as characters. They will have health and armor class (the amount you have to roll inorder to hit), they will also have xp you will get if you defeat them. The DM controlls the enemies you will face in the game. Depending on your level, your DM might use more of a lower monster or higher monsters.