What is a domain name and what is its use?

A domain name is the name of a computer or computer group on the Internet, which consists of a series of names separated by dots. It is used to identify the location of the computer (sometimes called geographical location) during data transmission. Although IP address can uniquely identify the computer on the network, it is a long string of numbers, which is not intuitive and is very inconvenient for users to remember, so people invented another character-based address scheme, the so-called domain name address.

There is a one-to-one correspondence between IP address and domain name. The information of this domain name address is stored in a host called Domain Name Server (DNS), and the corresponding conversion work is left to the DNS. Domain name server is a server that provides translation services between IP addresses and domain names.

Domain Name Server

The domain name server manages names by dividing them into different groups to be responsible for the names of each subsystem. Each layer in the system is called a domain, and each domain is separated by a dot. The so-called Domain Name Server (DNS) is actually a host with a domain name system. This is a hierarchical database that can perform name resolution.

DNS can allow name servers to "delegate" some of their name services to child servers, thus achieving a hierarchical namespace. In addition, DNS provides some additional information, such as system alias, contact information and which host acts as the mail center of the system group or domain.