Extensible Operating Systems are designed to allow users to add new features and functionalities without needing to modify the core system. This flexibility enables developers to create plugins or modules that can be integrated seamlessly, enhancing the system's capabilities. Examples of such systems include Linux and Android, which support a wide range of extensions. These operating systems often use a modular architecture, where components can be independently developed and updated. This approach not only fosters innovation but also allows for easier maintenance and customization. Users can tailor their experience according to their specific needs, making extensible operating systems highly adaptable.