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The purpose of using grout in tile installations centers primarily around filling the gaps between tiles, which not only provides a finished look but also enhances the overall aesthetic appeal of the tiling work. Grout serves to create a uniform and seamless appearance in the tiled surface, making it visually pleasing. It comes in various colors, allowing for customization that can complement or contrast with the tiles themselves.

Furthermore, grout helps to secure the tiles in place by filling the spaces, which can prevent debris from accumulating and also hinder the growth of mold and mildew in the joints. While grout does contribute to some extent to the structural integrity of the tiled surface by keeping the tiles evenly spaced, its main function is aesthetic and finishing in nature.

The other options highlight aspects that are related to different materials or processes in tile installation. Adhesives are responsible for adhering tiles to the substrate, and height adjustments are typically managed through backer boards or spacers rather than grout. While grout can help protect tiles from moisture to a degree, its primary role is focused on the visual aspect and ensuring a tidy appearance after installation.