What is the significance of the 'localhost (0)' part of the error message?

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Grade: Education Subject: Support
What is the significance of the 'localhost (0)' part of the error message?
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'localhost (0)' refers to the loopback address, which is the address your computer uses to communicate with itself. It means the MySQL server is attempting to connect to a process running on the same machine, but the connection isn't being established.