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A numbered doorway where a local or remote server listens for traffic.
Ports let multiple services run on the same machine. If a dev server says it is on port 3024, the browser visits localhost:3024 to reach it.
Plainly
Think of Port as roads and power for the app city. A numbered doorway where a local or remote server listens for traffic.
In practice
Use it when local behavior needs to become a reachable, reliable deployed service. In practice, define the owner, input, output, and failure mode before you rely on it.