Human-readable addresses that map to IP addresses through the Domain Name System (DNS). In cloud architecture, domain management is a core networking concern — cloud providers offer managed DNS services that route traffic, enable failover, support weighted routing, and integrate with CDNs and load balancers. Key services: AWS Route 53, Azure DNS, Google Cloud DNS, OCI DNS.
A SaaS company registers api.myapp.com using AWS Route 53. They configure latency-based routing to direct US users to us-east-1, EU users to eu-west-1, and APAC users to ap-southeast-1 — automatically routing each user to the fastest available region without any application changes.