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DNS. DNS is the system that makes the internet usable for humans. Instead of remembering long strings of numbers like IP addresses, you can type simple names like google.com and DNS takes care of the rest. At its core, DNS is like a phonebook for the internet. Every website has an IP address. But humans are terrible at remembering numbers. DNS translates domain names into IP addresses so your device knows where to connect. Here's how it works in practice. When you type a website into your browser, your device first checks if it already knows the IP address from a previous visit. If not, it sends a request to a DNS resolver, usually provided by your internet service or a service like Google or CloudFair. The resolver then goes through a process to find the correct address. It may contact root servers, then top-level domain servers like.com. And finally, the authoritative server that holds the exact IP address for that website. Once found, the IP is sent back to your device and the connection to the website begins. All of this happens in milliseconds. DNS also uses caching to speed things up. Once an address is resolved, it's stored temporarily, so future requests are faster. There are different types of DNS records as well. A records map a domain to an IPv4 address, AAA records map to IPv6. CNAME records point one domain to another, and MX records are used for email routing. One important thing to know is that basic DNS is not encrypted. This means requests can be seen or modified by networks. That's why newer versions like DNS over HTTPS and DNS over TLS exist, adding encryption for better privacy and security.

DNS. DNS is the system that makes the internet usable for humans. Instead of remembering long strings of numbers like IP addresses, you can type simple names l…