Docker builds containers. Kubernetes manages them at scale. They're not rivals — here's how they actually fit together with real code and decision frameworks.
Every developer hitting their first production deployment runs into this question: Do I need Docker, Kubernetes, or both?
It's the wrong framing. They don't compete. They operate at completely different layers of your infrastructure.
Let me be blunt upfront:
Docker = packages and runs your app as a container (single host)
Kubernetes = manages and scales those containers across many hosts
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