Polymer modified grout is a type of grout that has been enhanced with polymer additives to improve its performance. These polymers can be in the form of liquid or powder and are added to the cement mixture. The addition of polymers increases the grout's adhesion, flexibility, and resistance to cracking. It also improves water resistance and durability, making it suitable for areas exposed to moisture or heavy use. Polymer modified grout is commonly used in tile installations, masonry joints, and structural repairs where enhanced strength and durability are required.