The ozone layer is a protective shield in the Earth's atmosphere that absorbs most of the sun's harmful ultraviolet (UV) radiation. This layer is crucial for life on Earth, as excessive UV exposure can lead to skin cancer, cataracts, and harm to ecosystems. To protect the ozone layer, international agreements like the Montreal Protocol have been established to phase out substances that deplete it, such as chlorofluorocarbons (CFCs). These efforts have led to signs of recovery in the ozone layer, demonstrating the importance of global cooperation in environmental protection.