Q. What is the difference between clay and terracotta roof tiles?

In reality it is very difficult to point out the differences between the two. However clay and terra-cotta are different materials because clay is the raw material and terra-cotta is clay that has already been sculpted and baked. Typically any kind of organic clay may be used to create terra-cotta artifacts but earthenware clay has a distinctive brown-orange hue that distinguishes terra-cotta from other organic clays.