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A local server that runs an app while you are building it.
Dev servers rebuild quickly, show errors, and hot-reload changes. They prove local behavior, but they are not the same as a production deploy.
Plainly
Think of Dev Server as a tool from the builder toolbox. A local server that runs an app while you are building it.
In practice
Use it when you are installing, editing, testing, reviewing, or shipping code. In practice, define the owner, input, output, and failure mode before you rely on it.