What type of load balancing does the Service use and what algorithm does it use to distribute traffic among Pods?

In Kubernetes, the Service object typically uses load balancing types such as ClusterIP (internal cluster) or NodePort/LoadBalancer (external), but the Service itself does not implement complex load balancing algorithms.

Traffic distribution among Pods is done using a round-robin algorithm at the kube-proxy level, which manages iptables or ipvs rules. This means requests are sequentially directed in a circle to all available Pods.

If a more advanced load balancer considering Pod load or state is needed, Ingress controllers or external load balancers are used, which can apply algorithms like least connections, weighted round-robin, etc.