Domain Name System (DNS)
The Domain Name System (DNS) is a hierarchical and decentralized naming system for computers, services, or other resources connected to the Internet or a private network. It translates human-readable domain names (like example.com) into numerical IP addresses (like 192.0.2.1) that computers use to identify each other on the network, enabling users to access websites and services without memorizing complex numbers.
Developers should learn DNS because it is fundamental to web development, networking, and system administration, as it underpins how the Internet resolves addresses and routes traffic. It is essential for configuring domains, setting up web servers, managing email services, and implementing security measures like DNSSEC, with use cases including website deployment, load balancing, and CDN integration.