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The primary function of the Darwin operating system revolves around providing system-level services. Darwin serves as the foundation for macOS and iOS, integrating both the core operating system and various tools and technologies needed to manage hardware and software resources. This includes managing system processes, facilitating communication between hardware and software, and providing essential APIs and libraries that higher-level applications rely on.

Darwin provides the underlying architecture that supports features like memory management, process scheduling, and networking capabilities, ensuring that applications can operate efficiently and effectively. It is integral in maintaining the stability and performance of the operating system, making it vital for overall system functionality.

While web browsing, file management, and application development are important activities that may occur within the macOS or iOS environments, they are not functions of the Darwin operating system itself. Instead, those functions are built on top of the system-level services that Darwin provides, highlighting the fundamental role that Darwin plays in enabling a wide range of user-facing applications and services.