ClusterIP: This is the default ServiceType. This makes the Service only reachable from within the cluster and allows applications within the cluster to communicate with each other. There is no external access.

LoadBalancer: This ServiceType exposes the Services externally using the cloud provider's load balancer. Traffic from the external load balancer is directed at the backend Pods. The cloud provider decides how it is load-balanced.

NodePort: This allows the external traffic to access the Service by opening a specific port on all the nodes. Any traffic that is sent to this Port is then forwarded to the Service.

ExternalName: This type of Service maps a Service to a DNS name by using the contents of the externalName field by returning a CNAME record with its value. No proxying of any kind is set up.  

Load balancer

Cluster IP 

NodePort