A domain is a human-friendly name, such as example.com, that maps to an IP address via the DNS system. Domains make websites and services easier to remember and access. They consist of labels separated by dots, with top-level domains (TLDs) like .com, .org, or country codes at the end. Domains are registered through domain registrars and configured via DNS records.
Why it matters
Domains are essential for branding, usability, and discoverability on the internet. Proper domain configuration is required for hosting a web application, setting up email, enabling HTTPS, or routing traffic to cloud services.
Examples
Setting up a domain so it points to a server using an A record or configuring a CNAME for a subdomain like blog.example.com. Lessons like Domains and Subdomains explain domain structure.