A sealant is a material used to block the passage of fluids, air, or other substances in various applications. It is commonly applied in construction, automotive, and manufacturing industries to create a watertight or airtight seal. Sealants can be made from different materials, including silicone, polyurethane, and acrylic, each offering unique properties suited for specific tasks. In addition to preventing leaks, sealants also help improve energy efficiency by reducing drafts and moisture infiltration. They are often used in areas like windows, doors, and roofs, as well as in plumbing and electrical installations. Proper application of sealants can enhance the durability and longevity of structures and products.