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To be honest, what you said was 'what is the root password' (in both created threads). Which would be asking for a root password.
Hence my original response. Rather than saying 'what is a root password'. Which then I would would have just given you info on what it is.
Here are a couple of links to slightly lengthy explanations. Just use your "Find" option in the browser you are using and type 'password' on the link pages. It will help you find the info faster.
https
/en.wikipedia.org/wiki/Superuser...