The Domain Name System (DNS) is the internet’s directory service, translating human-readable domain names into IP addresses that computers use to communicate. Every time a user visits a website, sends an email, or accesses an online service, DNS helps locate the correct server. Common DNS record types include A, AAAA, MX, CNAME, TXT, NS, and SRV records, each serving a different purpose. Fast and reliable DNS improves website performance, while secure configurations help protect against attacks such as spoofing and cache poisoning. Understanding DNS is essential for web hosting, email delivery, cybersecurity, and maintaining reliable internet services across organizations of every size.