A domain name is a unique name that identifies an internet resource such as a website.  Any name registered in the DNS is a domain name. You can register with Megahost plenty of domains listed below.

Domain names are organized in subordinate levels (subdomains) of the DNS root domain, which is nameless. The first-level set of domain names are the top-level domains (TLDs), including the generic top-level domains (gTLDs), such as the prominent domains .com .info .net .edu .org country code top-level domains(ccTLDs). Below these top-level domains in the DNS hierarchy are the second-level and third-level domain names that are typically open for reservation by end-users who wish to connect local area networks to the Internet, create other publicly accessible Internet resources or run web sites.