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Modified thin-set refers to a specific type of thin-set mortar that has been enhanced with additives to improve its performance characteristics. These additives can include polymers that increase adhesion, flexibility, and water resistance, making it suitable for a wider range of applications compared to unmodified thin-set. When applied in tiling projects, this type of mortar can help ensure that tiles adhere effectively to substrates, particularly in areas that may experience temperature changes or moisture. The enhancements make modified thin-set ideal for use with various tile materials and in challenging installation environments, thereby providing a stronger and more reliable bond.

In contrast, the other options do not accurately describe modified thin-set. Decorative tiles refer to the aesthetics and styles of tiles used but do not relate to mortar types. A standard grout mix is used for filling the joints between tiles rather than adhering them. Lastly, a method of applying tile focuses on the technique used in installation rather than the specific product involved in the adhesion process.