# How DNS Resolution Works

Before trying to understand, how the dns resolution works , we need to understand the what do you mean by dns and resolution .

`DNS`\-domain name system

`Resolution`\-finding the solution of the problem

So basically ,Any device in the internet to communicate with each other, we need `IP(intenet protocal) address`.The example of ip address is `198.51.100.10`.just ask a question to yourself , memorizing number is easy or the name .if there is large number of devices , it becomes difficult to memorize the ip address.so its better to memorize the `domain name` .so the solution of problem is `dns resolution`.if you give `domain name` to `dns Resolver` then the `dns Resolver` gives you the `ip address` . once your browser gets the ip address , it can request corresponding web pages.

![](https://cdn.hashnode.com/res/hashnode/image/upload/v1768927675518/ec6a21da-6955-4be4-adcb-200982871e2f.png align="center")

so we understood the purpose of the dns , now lets understand in detail.

![](https://cdn.hashnode.com/res/hashnode/image/upload/v1768929625686/ba94c63b-da2b-43cd-bf66-3370a43881ce.png align="center")

so There are 4 server involved in dns resolution:

**1.recursive server:**

whenever we search any website in the browser then , this request goes to the recursive server which send of you the ip address of the website . the recursive job request to multiple server to find the ip address. the first request goes to the root server while the last request goes to the authoritative server/

**2.root server:**

this server returns the adress of tld server like .com,.org etc . based on what request it came to us , address of that tld only.

**3.TLD server:**

so the recursive server request to tld for ip of the domain name but it return the address NS of domain name.

**4.authoritative server:**

This is the only server who know the address of the website , it return the ip address to the recursive servive which then return to the browser.