iOS 16 is the sixteenth major release of Apple's mobile operating system, designed for iPhones. Launched in September 2022, it introduces new features like customizable lock screens, allowing users to personalize their devices with different fonts, colors, and widgets. Additionally, iOS 16 enhances messaging capabilities, enabling users to edit or unsend messages. It also improves privacy features, such as enhanced security for sensitive data and better tracking prevention in Safari. Overall, iOS 16 aims to provide a more personalized and secure user experience.