Domain Name (or Domain) is a unique name or address by which a Website is reachable. (For example, if a Website is reachable by the address "http://www.example.com", the Domain is "example.com"). If you have a license key for the example.com domain, then that key would work on all the subdomains - e.g. aaa.example.com, bbb.example.com.
What is a domain?
