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What is domain?

When somebody tells you that domain is address of a site — don't listen to him! Actually term specified in your address bar is not domain but domain name!

Domain is a logical division of a computer network, in which all nodes can reach each other by broadcast at the data link layer. A broadcast domain can be within the same LAN segment or it can be bridged to other LAN segments.

Domain name is an identification label that defines a realm of administrative autonomy, authority, or control on the Internet, based on the Domain Name System (DNS).

The length of a domain name have an a limitations due to administrative and technical specialties. Usually top leveld domains (TLDs) have an limitation up to 63 characters but in some TLDs domain names can contatin up to 127 characters. Anyway full domain name may not exceed a total length of 253 characters.

доменные зоны

The top-level domains (TLDs) are the highest level of domain names of the Internet. They form the DNS root zone of the hierarchical Domain Name System. Every domain name ends in a top-level or first-level domain label.

A DNS root zone is the top-level DNS zone in a Domain Name System (DNS) hierarchy. Most commonly it refers to the root zone of the largest global DNS, deployed for the Internet. The zone is managed by the Internet Assigned Numbers Authority (IANA), managed by ICANN.