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The operating system is an essential example of system software because it serves as the primary interface between the user and the computer's hardware. System software manages hardware components, provides a platform for running application software, and facilitates communication between different software programs and the hardware.

Operating systems handle various critical tasks such as memory management, task scheduling, device management, and system security. Examples of operating systems include Windows, macOS, and Linux. Their role is foundational to the functioning of a computer system since they enable applications, such as word processors or web browsers, to operate effectively by providing the necessary resources and services.

In contrast, the other options listed—word processors, web browsers, and game software—are examples of application software. These programs are designed to help users perform specific tasks like document creation, browsing the internet, or playing games, rather than managing the system's hardware.