What is a domain name system?

DNS, or Domain Name System, is a fundamental component of the Internet infrastructure. They convert domain names into numeric IP addresses, which are used to identify web servers and computers on the network. DNS are therefore essential for users to access websites and online services. In this article, we’ll take a closer look at what DNS is and how important it is to the operation of the Internet.

What is DNS?

DNS is a hierarchical, distributed domain name system that associates easily remembered domain names (such as www.example.com) with numeric IP addresses (such as When a user enters a domain name into their browser, the browser sends a DNS query to resolve the domain name to an IP address, and thus be able to access the website.

DNS works in a hierarchy of servers. At the top of the hierarchy are the root servers, which know the location of all the top-level domain name servers (TLDs), such as .com, .org, .fr, etc. The top-level name servers, in turn, know the location of the second-level name servers (for example, example.com), and so on.

Why is DNS important?

DNS are essential to the operation of the Internet. Without them, it would be impossible to access websites or online services using easily remembered domain names.

Here are some of the reasons why DNS are so important:

Ease of use: DNS allows for easy-to-remember domain names, rather than long, hard-to-remember numeric IP addresses. This makes it easier to access websites and online services.

Traffic redirection: DNS allows traffic to be redirected to different servers based on criteria such as geolocation or server load. This optimizes performance and ensures that users always access the closest and fastest website.

Flexibility: DNS makes it easy to change the location of servers.