Tree bark is the outer covering of a tree's trunk, branches, and roots. It serves as a protective layer, shielding the tree from pests, diseases, and harsh weather. Bark comes in various textures and colors, depending on the type of tree, such as the smooth maple or the rough oak. Bark is made up of several layers, including the outer bark, which is dead tissue, and the inner bark, which is alive and helps transport nutrients. Some animals, like woodpeckers, even rely on bark for food and shelter. Overall, bark plays a crucial role in a tree's health and survival.