The primary role of the ozone layer in the atmosphere is to protect life on Earth by absorbing the majority of the sun's harmful ultraviolet (UV) radiation. This shield prevents excessive UV exposure, which can lead to skin cancer, cataracts, and other health issues in humans, along with detrimental effects on animal populations and plant life. The ozone layer is a crucial component of the Earth's climate system, influencing weather patterns and temperatures. Protecting the ozone layer through international agreements, such as the Montreal Protocol, is essential for sustaining life and maintaining environmental balance.