What is the name of the Kubernetes resource used to expose an application?

A port is a network concept used within a Service definition, but it is not the Kubernetes resource itself that exposes the application.

A Kubernetes Service defines a logical set of Pods and a policy by which to access them, providing a stable network endpoint and load balancing for applications running inside the cluster or exposed externally.

DNS (Domain Name System) is a naming service that a Kubernetes Service leverages to provide discoverability, but it is not the resource itself that facilitates application exposure.

A Deployment manages the lifecycle and scaling of Pods but does not directly provide a stable network endpoint for exposing the application.