DEFINITION: Grout is a paste-like substance used to fill the gaps or joints between tiles, masonry blocks, or stones in construction or home improvement projects. It is typically made of a mixture of cement, water, and sand, and can also contain additives to improve its properties such as color pigments, latex, or polymer-based compounds for enhanced durability and flexibility. Grout is applied after the tiles or blocks are set in place, filling the gaps between them and providing a cohesive, finished look to the surface. It helps to prevent water, dirt, and debris from penetrating between the tiles and also adds stability and support to the overall structure. Grout can come in a variety of colors and textures to match the surrounding material and can be applied either sanded or unsanded, depending on the width of the joints.