Caulking is the process of sealing joints or gaps between different surfaces, such as between tiles, around windows or doors, and along baseboards. It involves applying a waterproof sealant, also called caulk, to prevent air, water, and moisture from getting through.

This helps to improve the energy efficiency, durability, and appearance of buildings and structures. Caulking can be done using a variety of materials, including silicone, latex, and polyurethane, and can be applied using a caulking gun or putty knife.

It is an important task in home maintenance and renovation projects and requires proper preparation and technique in order to achieve a clean and effective seal.