when we search URL like google.com or any other URL on the web browser the domain name system helps the web browser to understand what has been searched using IP addresses which are mapped with the URL and IP addresses are unique for each URL so that the computer can distinguish the content of different url and can provide information related to that url .The process that happens when we write google.com The DNS helps the web browser to find IP address corresponding to the url which is mapped through this IP address web browser sends a request to the DNS server which sends back the IP address to the browser then the web browser sends the request for the website to the web server then the web server sends the content of the website to web browser then the web browser renders it and display it on the web browser.