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A Kubernetes Service is an abstraction which defines a logical set of Pods running somewhere in your cluster, that all provide the same functionality. When created, each Service is assigned a unique IP address (also called clusterIP). This address is tied to the lifespan of the Service, and will not change while the Service is alive. Pods can be configured to talk to the Service, and know that communication to the Service will be automatically load-balanced out to some pod that is a member of the Service.

A Service is backed by a group of Pods. These Pods are exposed through endpoints. The Service’s selector will be evaluated continuously and the results will be POSTed to an Endpoints object also named my-nginx. When a Pod dies, it is automatically removed from the endpoints, and new Pods matching the Service’s selector will automatically get added to the endpoints. To know the details, check Show details of service.

Reference:
https://kubernetes.io/docs/concepts/services-networking/connect-applications-service/