The ozone layer is a region of Earth's stratosphere that contains a high concentration of ozone (O₃) molecules. It plays a crucial role in protecting life on our planet by absorbing the majority of the sun's harmful ultraviolet (UV) radiation. Without this layer, increased UV exposure could lead to higher rates of skin cancer, cataracts, and other health issues. The ozone layer is not uniform and can vary in thickness depending on factors like season and geographic location. Human activities, particularly the release of chlorofluorocarbons (CFCs), have contributed to its depletion, prompting international agreements like the Montreal Protocol to phase out harmful substances and protect this vital layer.