A domain name is a string that identifies a realm of administrative autonomy, authority, or control in the Internet. It is used to identify services provided through the Internet, such as websites and email services. Domain names are formed by the rules and procedures of the Domain Name System (DNS) and are organized in subordinate levels (subdomains) of the DNS root domain. The first-level set of domain names are the top-level domains (TLDs), including generic top-level domains (gTLDs) and country code top-level domains (ccTLDs) .
In addition to being used in the context of the Internet, the term "domain" can also refer to how an organizations network resources are organized. In this context, a domain is a group of resources assigned to a specific group of individuals and is used to divide global areas or departments of a corporation.
Overall, a domain name is an easy-to-remember address used to access websites, and it plays a crucial role in providing a human-readable address for any web server available on the Internet.