The mobile operating system developed by Apple is called iOS. It's designed for use on Apple's mobile devices, including the iPhone, iPad, and iPod Touch. Known for its user-friendly interface, iOS emphasizes smooth performance and security, allowing users to access numerous applications through the App Store. With regular updates, Apple introduces new features and improvements, ensuring optimal functionality and security for its users. The tightly integrated ecosystem of hardware and software contributes to iOS's popularity and sets it apart from other mobile operating systems.