Joint sealing is the process of applying a flexible material to the gaps or joints between building materials, such as floors, walls, or pavements, to prevent the infiltration of water, dust, or debris. It also helps to accommodate movement caused by temperature changes, settling, or vibration. Common sealing materials include silicone, polyurethane, and acrylic, which provide durability, flexibility, and weather resistance. Joint sealing improves structural integrity and extends the lifespan of surfaces.