Wall tiles are made by the dust-press method, and the machine-made precision of their shapes works pretty well with the clean lines of many contemporary designs. Usually wall tiles are set closely together, with thin grout lines -- often calibrated via spacers on the tiles' edges.
In recent time, demand for ceramic glazed tiles is replaced by polished porcelain tiles (popularly known as "vitrified tiles" in India). Ceramic glazed tiles typically have a glazed upper surface and when that becomes scratched the floor looks worn, whereas the same amount of wear on Vitrified tiles won't show, or will be less noticeable. This is the reason for the boom of vitrified tiles manufacturing in Morbi.
Vitrified tiles are made with dust compression method so it becomes harder, denser & less porous than normal ceramic tiles. It is then fired at very high temperatures exceeding 1250 degree centigrade resulting in an extremely hard, dense, homogenous tile. Vitrified tiles are then polished to a very high finish using exactly the same equipment as is used to polish the Granite and Marble. Since vitrified tiles are less porous then ceramic tiles, they are also easy to clean.