Tributyltin chloride is primarily used as a biocide in antifouling paints applied to ship hulls, boats, and underwater structures to prevent the growth of marine organisms like algae, barnacles, and mollusks. Its effectiveness in controlling biofouling helps improve fuel efficiency and reduce maintenance costs for marine vessels. Additionally, it has been utilized as a wood preservative to protect against fungi and insects, extending the lifespan of treated wood in outdoor applications. In industrial settings, it serves as a catalyst in chemical reactions, particularly in the production of polyurethane foams and silicone coatings. However, due to its high toxicity to aquatic life and environmental persistence, its use has been heavily regulated or banned in many regions.