Route53
In plain terms
Amazon's scalable DNS and domain service.
Going deeper
Route 53 resolves domain names to AWS and other resources, with health checks and traffic routing policies. It's AWS's managed DNS.
Under the hood
Supports latency/geo/failover routing and health-based DNS; the '53' nods to the DNS port.
Examples
Domain registration, DNS, failover routing, traffic management, AWS apps.
Think of it like...
Like a smart switchboard directing visitors to the nearest or healthiest location.