What is a domain name system(dns)?

In this presentation, I have listed from various sources different definitions of DNS and how they work

1. What is domain name system(DNS) ?

2. According to Thousand Eyes The Domain Name System (DNS) is the Internet's system for mapping alphabetic names to numeric Internet Protocol (IP) addresses like a phone book maps a person's name to a phone number. For example, when a Web address (URL) is typed into a browser, a DNS query is made to learn an IP address of a Web server associated with that name.

3. According to Wikipedia The  Domain Name System  ( DNS ) is a  hierarchical  and  decentralized  naming system for computers,  services , or other resources connected to the  Internet  or a private network. It associates various information with  domain names  assigned to each of the participating entities. Most prominently, it translates more readily memorized domain names to the numerical  IP addresses  needed for locating and identifying computer services and devices with the underlying  network protocols . By providing a worldwide,  distributed   directory service , the Domain Name System has been an essential component of the functionality of the Internet since 1985.

4. According to AWS DNS, or the Domain Name System, translates human readable domain names (for example, www.amazon.com) to machine readable IP addresses (for example, 192.0.2.44).

5. HOW DNS WORKS?

6. According to Ques10 When user type a domain name (URL) such as google.com into browser using client computer operating system such as Windows or Apple OS. The client needs to find the IP address where google.com search engine is located on the earth (typically all websites are hosted in the Internet data center). Then browser will send this query to the operating system. Each operating system is configured to query certain DNS Servers. Typically users ISP or network administrator configures such DNS servers called Resolving Name Server. The resolving name server does not aware of the location of the google.com, but it does know where the root servers are located.

7. Image Source: https://www.ques10.com/p/29009/what-is-url-explain-working-of-dns/

8. Next, the resolving name server finds the location of the Top Level Domain (TLD) name server to send query for google.com. Each domain on the Internet has Authoritative Name Server. Finally, the authoritative name server will give user exact IP address of google.com. This information will come back to the resolving name server, which caches the information and send backs an answer (answer to user query what is IP address of google.com) on browser to the correct place. The end result user will see google search engine home page.

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