Vitrified tile is a tile is produced using vitrification and has very low porosity (and water absorption), making it stain-resistant and strong. It is an alternative to marble and granite flooring.
Being a manufactured product, their quality is controlled, whereas in naturally occurring marble and granite good quality is coincidental. Vitrified tiles possess better mechanical strength, scratch resistance, resistance to acids, alkalis and chemicals, resistance to staining etc compared to marble or natural granite.
Marble has a relatively lower abrasion resistance and higher porosity compared to vitrified tiles. It is composed of calcium carbonate, a compound that is readily attacked by hydrochloric acid, which is commonly used in toilet & floor cleaning. It can yellow within a span of a few years, whereas vitrified tiles retain their colour for decades.
Polished natural granite shows surface defects, and good quality is just a matter of chance, whereas vitrified tiles are produced under controlled conditions that result in consistent quality.