A "Restricted Domain" refers to a specific area or field where access, participation, or information is limited to certain individuals or groups. This can occur in various contexts, such as academic research, where only qualified researchers can access sensitive data, or in online platforms, where certain content is available only to registered users. In the context of the internet, a restricted domain may also refer to websites or online services that require special permissions or credentials to access. For example, government websites often have restricted domains to protect sensitive information, ensuring that only authorized personnel can view or interact with the content.