They have the function of technically regrown material made of cement, minerals, fine sand and additives that help in having more fluidity. This eases the leveling, planimetry and the finishing, which then results into a flatter and more decorative finishing.
The treatment that should be done is rather specific, since they can be applied to the majority of bases from which a spectacular result and a considerable resistance can be obtained. However, there is one objection: its use is limited to interior floors.