What Is DNS (Domain Name System)?
DNS (Domain Name System) is the fundamental internet infrastructure that translates human-readable domain names (like nicename.me) into machine-readable IP addresses (like 104.21.3.142) that computers use to locate each other. Without DNS, you'd need to memorize strings of numbers to visit any website.
When you type a domain into your browser, a DNS resolver queries a series of DNS servers — from root servers to TLD servers to authoritative nameservers — until it finds the IP address associated with that domain. This lookup typically happens in milliseconds.
DNS is also responsible for email routing (MX records), domain verification (TXT records), and various other domain-level services. It's the backbone that makes domain names functional.
Why This Matters for Startups
You'll interact with DNS when setting up your website hosting, configuring email, verifying domain ownership for services like Google Search Console, and connecting your domain to various platforms. Understanding the basics — A records point to your web server, MX records handle email, CNAME records create aliases — saves you hours of confusion when launching your startup's online presence. Most DNS changes take minutes to hours to propagate globally, so plan DNS changes before important launches.
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