What is ozone and how does it affect any ecosystem?

Ozone (O3) is a molecule, made up of the three atoms of oxygen. Ozone(O3) forms a layer in the upper atmosphere, it is very essential for the life on this planet. It shields the surface of the earth from ultra-violet (UV) coming from sun as these radiations are very harmful causing skin cancer and cataract in humans. It also does harm to the corps.