DNS
Put simply, the Domain Name System (DNS for short) is the "telephone book" for the internet. Every computer or server has a unique IP address, similar to a human fingerprint. To find out someone's telephone number, you search for their name in a telephone book. The DNS also looks for the computer name to find out the unique IP address of the computer or server. The IP address is then used to establish a connection to the server. The Domain Name System resolves computer names into IP addresses and vice versa. To do this, the DNS accesses a central database. The information in this central database is distributed among thousands of name servers (so-called DNS servers).