Grout is a dense, paste-like material used to fill the gaps between tiles, bricks, and stones. It is typically applied after the installation of tiles to create a smooth and durable finish, ensuring that tiles stay in place while preventing moisture from entering the joints. Grout comes in various types, including sanded and unsanded options, and is available in a range of colors to match tile designs. Shopping for grout online offers a variety of formulas and colors, ensuring you can find the right grout for your tiling project.