There are two main types of floor tile, ceramic and porcelain. While both are durable and appropriate to use, there are noticeable differences between them.
Ceramic tile are composed of fired clay with a glaze coating. While usually less expensive than porcelain tile, ceramic are not as durable.
Porcelain tile are made of sand fired at high temperature and pressure. Porcelain tile are harder than ceramic and not porous, making them more water resistant. On the downside, porcelain tile are more difficult to cut than ceramic.