What characterizes a restricted domain extension?

A restricted domain extension is characterized by its accessibility being limited to specific groups or individuals who meet certain criteria. In this context, only credentialed professionals can register and use such a domain, ensuring that the content and purposes associated with it maintain a certain standard of quality or expertise.

This limitation serves to create a level of trust and reliability regarding the information presented under that domain. For instance, domains like .edu are typically reserved for educational institutions, which must meet defined standards to qualify. This contrasts with other domain extensions that are open to anyone and do not require any specific credentials or affiliations. Therefore, the defining aspect of a restricted domain is its selective accessibility based on professional qualifications.