Tile grout is a material used to fill the spaces between tiles, providing both aesthetic appeal and structural support. It helps to keep tiles in place and prevents moisture from seeping underneath, which can lead to damage. Grout comes in various colors and types, allowing for customization based on the design of the tiled surface. There are two main types of grout: sanded and unsanded. Sanded grout contains fine sand, making it suitable for wider joints, while unsanded grout is smoother and ideal for narrow joints. Proper application and maintenance of grout are essential for the longevity of tiled surfaces.