Web basics

DNS

The internet's phone book that turns a domain name into a server address.

DNS (Domain Name System) translates human names like `yourapp.com` into the numeric IP addresses computers actually use to find each other. When you buy a domain and point it at Vercel or connect a custom email domain to Resend, you're editing DNS records (A, CNAME, MX, TXT) to say 'traffic for this name goes here.' Two things bite vibe coders constantly: changes can take minutes to hours to propagate, and one wrong or missing record means your site or emails silently won't work — so double-check records against the provider's exact instructions.