The ozone layer is essentially located in the below part of the stratosphere from around 20 to 30 kilometers over Earth, though the width changes seasonally and geographically.
The ozone layer defends the earth from the sun's UV Rays.
Ozone layer is a fumes in the environment that preserves everything existing on the Earth from damaging ultraviolet rays from the Sun.
The ozone layer serves as a defense to swallow the UV rays, and prevent them from causing damage at the Earth's cover.