Could someone explain /etc/resolv.conf please? (cPanel)

I just really need a rundown of just what it is and how to set it up correctly. It's how I learn best. Could someone explain /etc/resolv.conf please? (cPanel)

What do I put for the secondary and teritary resolvers?

Enter the ip address of at least two nameservers that you will use for dns resolution.
Are those the DNS servers that my bandwidth provider is using?

This statement scares me:

It is very important that these nameservers are correct, or you server will not function properly. If you do not know what to put in the boxes below and cannot contact your provider, please close this window and go though this setup at a later time; Your server should still function normally, however connections made to the server may be slower then normal.
Well, doesn't scare me just makes me want to make sure I get it right.

Anyone got a second to help me understand this?

Thanks,
Aaron

 

 

 

 

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