Why is the ozone layer in the stratosphere

I think that the ozone layer is a deeply layer in the stratosphere which encircling the Earth that has large amounts of ozone present in it. This layer shields the entire Earth from much of the harmful ultraviolet radiation that comes from the sun.it is also this ultraviolet radiation that forms the ozone in the first place.the information about the ozone that how it makes which is that Ozone is a special form of oxygen, made up of three oxygen atoms rather than the usual two oxygen atoms. ozone forms when some type of radiation discharge separates the two atoms in an oxygen molecule, which can then individually recombine with other oxygen molecules to form ozone (O3).