Difference between Email By Document Field and CC

Can anyone here tell me about the difference between " Email By Document Field" and “CC” in Email alert document?

I have tried by using CC and dont know about other 2 coloumns (Email By Role,Email By Document Field")

Can anyone tell about this 2 coloumns with small example?

Email by document field allows you to email field from the selected doctype.

Email by role send the email to all users subscribed to that role.

CC allows yo to designate whatever email you want (1 email per line)

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What do you mean by one email per line? Please tell me