What is a top-level domain (tld)?

A top-level domain (tld) is the portion of the domain name that appears to the right of the “dot” and is no longer limited to three characters. Every domain name must end with a tld. There were two types of tlds: generic top-level domains (gTLDs) like .net or .com. and country code top-level domains (ccTLDs) like .uk or .cn. Each tld is operated by a registry, which is responsible for technically supporting the tld and developing policies for the maintenance and allocation of the tld.