Kubernetes is a system that runs and manages containerized applications automatically.

Instead of manually running containers, Kubernetes:

• Starts them
• Stops them
• Restarts them when they fail
• Scales them up or down

Kubernetes = “automated container manager”

—

Imagine you have a web application:

Without Kubernetes:

• You run Docker containers manually
• If one crashes → you restart it yourself
• If traffic increases → you manually add more containers

With Kubernetes:

• You define: “I want 3 instances running”
• Kubernetes ensures 3 instances are always running
• If one crashes → it automatically replaces it
• If traffic increases → it can add more instances automatically

—

Kubernetes is like a restaurant manager:

• You (developer) define the menu (desired state)
• Kubernetes ensures chefs (containers) are always available
• If a chef leaves → it hires a new one automatically