Sponsored top-level domain

A sponsored top-level domain (sTLD) is one of the categories of top-level domains (TLDs) maintained by the Internet Assigned Numbers Authority (IANA) for use in the Domain Name System of the Internet, alongside country-code top-level domains (ccTLD) and generic top-level domains (gTLD). A sponsored TLD is a specialized top-level domain that has a sponsor representing a specific community served by the domain.

Source: Wikipedia — Sponsored top-level domain (CC BY-SA 4.0)