A tree is considered to be wounded when its bark is broken so that either its inner bark or wood is exposed to the air. Tree wounds are caused by various agents, including birds, animals, insects, fire, mechanical equipment, lightning, or people and their activities. Tree wounds are classified into three types, depending on their locations: branch wounds, trunk wounds, and root wounds. By allowing Urban Tree Service to inspect and find a treatment for the wound it prevents future problems that could occur if the wound does not get treated. This improves the overall health of the tree and allows the tree to use its optimal defenses in the best possible way.