The ozonosphere refers to a region in the Earth's atmosphere that is rich in ozone, a gas that protects us from the harmful effects of the sun's ultraviolet radiation. Synonyms for the ozonosphere include the ozone layer, ozone shield, and ozone stratosphere. While these terms are often used interchangeably, they all refer to the same protective layer of ozone in the upper atmosphere. The ozone layer has been the focus of much attention over the past few decades, as it has been depleted by human-made chemicals. Efforts to protect and restore the ozone layer have been successful in many parts of the world, but there is still much work to be done to ensure the continued health of our planet.