What does the "Address already in use" error in MongoDB's mongod mean?

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The "Address already in use" error in MongoDB's mongod means that the port or address that mongod is trying to listen on is already in use by another process. This can happen if there is another instance of mongod or a different service running on the same port or address, or if the previous instance of mongod did not shut down cleanly and the port is still in use. To resolve this error, you can identify and stop the other process using the same port or address, or specify a different port or address for mongod to listen on.