Domain name:-It is a quite difficult to remember IP addresses since they are just a bunch of numbers.To make simpler for users,every website not only has an IP address,but also has a corresponding domain name.A domain name is an easy-to-remember name for a website.For example, www.facebook.com is an example of a domain name.
Domain name system(DNS) lookups:-The process of converting a domain name into respective IP address is known as DNS lookup.Your browser performs a DNS lookup automatically in the background each time you type a website address in your browser.
DNS server:-A DNS server is a server that handles DNS lookup queries from browsers/users and sends back replies to them.Your college,company or organization will have its own DNS server that will manage the local user's DNS lookup requests.
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