Kubernetes
In plain terms
A system that automates running containers across many machines.
Going deeper
Kubernetes ('K8s') schedules containers onto a cluster, restarts failed ones, scales them up or down with demand, and handles networking and rollouts. It's the standard control plane for large containerized systems.
Under the hood
Declarative and self-healing: you specify desired state and controllers reconcile toward it; the learning curve and operational complexity are significant.
Examples
Deployments, Services, Ingress, kubectl, Helm charts, EKS/GKE/AKS.
Think of it like...
Like an air-traffic control tower for shipping containers: deciding which plane (server) carries what, rerouting around problems, and adding flights when traffic spikes.