A Service in Kubernetes is an object that provides a stable IP address, DNS name, and consistent network access to a group of Pods.

Because Pods are temporary — they die, restart, or get new IPs — a Service makes sure that:

• ✔ Applications can find and talk to Pods reliably
• ✔ Network traffic is load-balanced across Pods
• ✔ The communication remains stable even if Pods change

🧠 Why Services Exist

Pods are not permanent:

• Their IPs keep changing
• Pods come and go during scaling
• New Pods replace old Pods during deployments

Without Services, apps would have no stable way to reach Pods.

A Service hides Pod changes behind a fixed, reliable endpoint.

🎯 What a Service Provides

🔹 Stable ClusterIP

A virtual IP that does NOT change.

🔹 DNS name

Example:

myapp.default.svc.cluster.local

🔹 Load balancing

Traffic is automatically distributed to healthy Pods.

🔹 Service Discovery

Apps always know how to find each other.

🏗️ How Services Work Internally

A Service selects Pods using labels:

selector:
  app: myapp

Then Kubernetes creates:

• Endpoints/EndpointSlices = list of Pod IPs behind the Service
• Rules in kube-proxy (iptables/ipvs) to route traffic

When you access the Service IP → kube-proxy forwards the request to one of the matching Pods.

📝 One-Line Interview Definition

A Service in Kubernetes is a stable networking endpoint that 
provides consistent access, load balancing, and 
discovery to a dynamic group of Pods.