Caulk is a sealing material used to fill gaps and prevent water or air from entering. It is commonly used to seal gaps around windows, doors, and other openings in wood flooring. Caulk is available in various materials, including silicone, latex, and acrylic, each with its properties and benefits. When selecting a caulk for wood flooring, consider the climate, moisture levels, and the type of wood used to ensure the caulk’s compatibility and effectiveness.