Melaleuca alternifolia, commonly known as tea tree, is a species of tree native to Australia. It is well-known for its medicinal properties and is widely used in natural and alternative medicine.

Tea tree oil, derived from the leaves of Melaleuca alternifolia, is the most commonly used form of this plant. It has natural antibacterial, antifungal, and anti-inflammatory properties, making it a popular ingredient in skincare products, hair care products, and natural remedies.