Medicinal bark refers to the outer layer of certain trees and plants that contains compounds beneficial for health. Many cultures have used these barks for centuries in traditional medicine to treat various ailments. For example, the bark of the willow tree is known for its pain-relieving properties due to the presence of salicin, which is a precursor to aspirin. In addition to pain relief, other types of medicinal bark, such as cinchona bark, are used to treat fevers and malaria. The active compounds in these barks can have anti-inflammatory, antimicrobial, and antioxidant effects. As a result, medicinal bark continues to be an important resource in both traditional and modern herbal medicine.