iOS 15 is the fifteenth major release of Apple's mobile operating system, launched in September 2021. It introduced several new features aimed at enhancing user experience, including improved notifications, Focus modes to minimize distractions, and updates to FaceTime that allow for spatial audio and grid view. Additionally, iOS 15 brought enhancements to the Safari browser, including a redesigned tab bar and improved privacy features. The update also included new tools for Maps, Weather, and Photos, making it easier for users to access information and stay organized on their devices.