DNS mapping is the process of connecting a domain name to the IP address or cloud resource where your application is running. It allows users to access your application using a domain name instead of an IP address.
For example, www.example.com can be mapped to an Elastic Load Balancer (ELB) or an Amazon EC2 instance using Amazon Route 53. When users enter the domain name, DNS automatically directs them to the correct destination.
In simple words, DNS mapping links a domain name to your server or application, making it easy for users to access it.