The function of an operating system (OS) in mobile devices is to manage hardware resources and provide a user interface for applications. The OS acts as an intermediary between the device hardware—such as processors, memory, and sensors—and software applications, ensuring optimal performance. It manages tasks such as memory allocation, process scheduling, and device control. Popular mobile operating systems include Android and iOS, both offering unique features and app ecosystems. By creating a seamless experience for users, mobile operating systems enable the execution of diverse applications while maintaining device functionality and security.