DNS
DNS (Domain Name System) 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. Manual DNS refers to the process of manually configuring DNS records, such as A, CNAME, MX, or TXT records, rather than relying on automated tools or managed services.
Developers should learn manual DNS configuration when setting up custom domains for web applications, managing email servers, implementing security measures like SPF or DKIM, or troubleshooting network issues. It is essential for DevOps and system administration roles, as it provides fine-grained control over domain routing, load balancing, and service discovery in on-premises or cloud environments.