The DNS is divided into three parts: the host (host or server), the domain, and the top-level domain (Top Level Domain -TLD). The Internet DNS system works like a phone book where the mapping between names and numbers is managed. Without DNS, the names of domains that we commonly use would not work.
DNS are the initials of Domain Name System (system of domain names) and is a technology based on a database that is used to resolve names in networks, that is, to know the IP address of the machine where the domain is hosted to which we want to access. On the other hand the DNS is a system that serves to translate the names in the network, and is composed of three parts with well differentiated functions.
Each electronic device that connects to the Internet has a unique address called IP address, which makes that connection possible. The IP address (Internet Protocol) is a unique and unrepeatable address that identifies logically and hierarchically any device that uses the IP protocol connected to a communications protocol through the network. It consists of a set of four numbers ranging from zero to ten fifty-five, where the only thing that separates it is a point.
Some of the functions or features that this important tool has are the following: Resolution of names, Resolution of mail servers, Reverse address resolution, among others. Each of these functions makes the DNS a useful and effective tool.
Therefore, the DNS what it does is that this IP address transforms it into a domain name so that the user who wants to access said page makes it easier to find it, that is, it is easier to remember a domain name than numbers for example 192.170.113.09 Imagine that this IP address belongs to a web vagina, and that this is the domain name infopedias.com transformed by the DNS, your as a user which of the two you think is easier to remember at the moment you want to access this page to look for something, logically you will say that the domain name and you are right for that is the importance of the DNS for each of us.