Top-level domain

In the Domain Name System, the highest level of the hierarchy after the root is the top-level domain (TLD). In a domain name, that portion of the domain name that appears furthest to the right is the TLD.

The TLD initially denoted the intended function of that portion of the domain space. For example, ".com" was established for commercial users, ".org" for not-for-profit organizations, and ".net" for network service providers.