Tung oil is a natural oil extracted from the seeds of the tung tree, native to China. It is known for its drying properties, which allow it to harden when exposed to air. This makes it a popular choice for finishing wood surfaces, providing a protective layer that enhances the wood's appearance. In addition to woodworking, tung oil is also used in various applications, including paints, varnishes, and sealants. Its resistance to water and mildew makes it suitable for outdoor furniture and marine finishes, ensuring durability and longevity in exposed environments.