What is DNS Server?

In the previous post, we gave a shop. Now let's say you named the shop 187.599.255.147.257 instead of Rahim Store. How many people will remember this name now? It will be seen after a few days that you do not remember the name of your shop too, and if people don't remember the name of the shop, people will not come to your shop and therefore the sales of the shop will decrease.

Similarly, your website is connected to the internet by a unique IP address, and we can access that website only by hitting that IP address. For example, the IP Address of "google.com" is: "172.217.168.238" But now the problem is, it is not possible for people to remember this IP Address and your computer also cannot find the website without the IP Address. DNS servers are created to solve this problem. The work of a DNS server or Domain Name System server is to store all information related to the domain. When we search by typing a domain name, this DNS server sends us the IP address for that domain, then our browser hits that IP address and we can access that website. All websites in the world have different IP addresses. 

When we search for a Domain Name from our browser for the first time, it searches for the IP Address of that Domain Name on the server of our ISP (Internet Service Provider), if it is found, it sends the address to our browser. And if not found in the ISP's server, then the ISP will send the request to the Domain Server's Main Server, the Root Server. There are a total of 13 root servers in the world. Now the interesting thing is, the Root Server doesn't know anything about the IP Address of the domain but it knows where this IP Address is. It sees the domain extension and sends the ISP Server to the TLD Server. Finally, the TLD Server sends the ISP Server to the Name Server and this Name Server knows everything about the domain. Then the IP Address from the Name Server comes to the ISP Server and from the ISP Server to our browser.

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