Many engineers think of Docker as a "lightweight VM," but that's an architectural oversimplification. The real difference lies in the isolation boundary.
While a Virtual Machine (VM) mimics an entire hardware set to run a unique kernel, Docker abstracts the Operating System itself to share the host's kernel.
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Choose VMs when: You need to run a different OS (e.g., Windows on Linux), require strict regulatory hardware isolation, or are running a massive stateful monolith.
Choose Docker when: You are building microservices, need to scale horizontally in seconds, or want a consistent environment across Dev, Staging, and Production.


