The Domain Name System (or DNS) converts human readable domain names (like: www.google.com) into Internet Protocol (IP) addresses (like: 220.127.116.11)
Computers can only communicate using a series of numbers, so DNS was developed as a sort of “phone book” that translates the domain you enter in your browser into a computer readable IP.
When you search for a website or web-page , your browser will not know the i.p address of the web server. Your browser will first check its cache memory to see if it has the DNS records for that domain cached. It also checks the
hostfile of your computer/mobile for the ip address.
Your ISP (Internet Service Provider) caches popular sites like Google.com , Netflix.com , (facebook?), Youtube.com etc. If they have the record in their cache, you would skip the rest of the DNS lookup process.
Top Level Domains are
Top Level Domain servers have information about the
Master/Authoritative DNS servers which actually contain the server information.
Root DNS servers are tasked to find and point to the Top Level Domain Servers.
This entire DNS lookup process happens in just a couple milliseconds. For perspective, we blink our eyes in roughly 50 milliseconds. We can resolve most DNS queries in under 30 milliseconds.👀