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What is DNS? 🌐 DNS (Domain Name System) is like the phonebook of the internet. It translates human-friendly domain names (like https://t.co/Bn7gxZOWqT) into IP addresses (like 192.0.2.1) that computers use to identify each other on the network. How DNS Works 1. User Request When you type a web address (URL) into your browser, you're making a user request. For example, typing https://t.co/Bn7gxZOWqT into your browser and hitting enter. The purpose of this is, The browser needs to find the IP address of https://t.co/Bn7gxZOWqT to load the website. 2. DNS Lookup The browser first checks its local cache to see if it already knows the IP address. If not, it sends a request to the local DNS resolver (often your ISP's DNS server). The purpose of this is to start the process of finding the IP address for the given domain name. 3. DNS Resolve The local DNS resolver checks its cache. If it doesn't have the answer, it queries other DNS servers in a hierarchical manner, starting with the root DNS servers, then moving to TLD (Top-Level Domain) servers (like .com, .org), and finally to authoritative DNS servers that have the information. The purpose of this is to translate the domain name into an IP address by querying various DNS servers. 4. DNS Response Once the authoritative DNS server provides the IP address, the local DNS resolver caches the response and sends it back to the browser. The purpose of this is, The browser now knows the IP address of the requested domain and can connect to the web server to load the website.