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DNS: the three letters that hold the Internet

To access the desired site on the Internet, we enter its domain name in the browser line. But the domain name of the site is not its real address. In fact, a website address consists of numbers and is called an IP address. You don't need to know this to open the web page you want, because DNS works.

What are DNS servers?

These are servers that store information about which IP address corresponds to which domain name, something like a physical phone book, only domain names and IP addresses are written to it instead of a name and phone number. There are many such servers on the Internet. Click here for more details Let's say you or someone else wants to host your site on the Internet. First of all, you need to create and register a domain name (in short a domain). But this is not enough for the site to work: the registrar also needs the domain name of the DNS server, which will store information about your domain and its IP address. This DNS server will become the authoritative name server for your site and the main source of information about its address for the DNS system, where the path is recorded.

What is the DNS service and what is the role of DNS servers?

The purpose of DNS servers is not only to store information about the correspondence of IP addresses and domain names. They can also cache (i.e. store) IP addresses previously requested by the user. For example: if you access a remote DNS server for this IP address all the time, the site will take a long time to load. To solve this problem, information about frequently visited sites is stored by the DNS server closest to your computer, usually at your ISP.