The Internet is a countless number of physical devices (servers, computers, tablets, laptops, etc.) interconnected in a network. In fact, every website is located on a physical device. Each device has its own unique number, an IP address of the form 22.214.171.124. Therefore, for the convenience of working on the Internet in the 1980s, a domain name system was created DNS (Domain Name System). When you enter a domain name in your browser, the DNS servers translate it into an IP address.
What are DNS servers for?
The domain name service is powered by DNS servers. These are the vital "programs" that store mapping tables of the form "domain name" - "IP address". In addition, DNS servers are used to store domain resource records. Click here for further explanation https://www.tipsyoumustknow.com/ What are resource records? There are a large number of DNS servers on the Internet, each performing its own function in the overall system. The Domain Name System service is essential so that you can easily find our favourite sites without memorising the string of numbers.
How to register DNS servers
DNS servers are usually registered in pairs. One DNS is primary and the rest of the servers, which can be between 1 and 12 for each domain, are called secondary. This is done for better fault tolerance: if one DNS server goes down, the domain and site will continue to function.
Why don't domains start working right away?
The Internet provider's DNS servers are updated once a day (DNS server operation). If you have just registered or changed your DNS server, you will have to wait 24 hours. The change of DNS server is heavy of the temporary absence of a working site. After the DNS update, the site will become available. If the site is not working, there is an instruction to help you: I have registered the DNS servers, but the site is not available.