Docker and Kubernetes, explained plainly

What containers solve, what Kubernetes adds, and when you actually need both.

Docker packages an app and everything it needs to run. Kubernetes helps run lots of those containers across machines.

For many teams, Docker is the first big step because it makes local development and deployment behave more alike. Kubernetes matters once the team needs scheduling, scaling, service discovery, or cleaner operations across more than a few containers.

You do not need Kubernetes just because it is popular. You need it when the application and team are at a point where orchestration is solving a real problem.