It is a document folder where the website file for the domain name is stored. cPanel allows to collaboration multiple domain names (Addon domain, subdomain) you need to have a unique folder for each domain.
But always remember that your primary domain stored in the Document Root Folder.
public_html/folder
If you want to see the document folder then you have to log into cPanel account. and there you will see document folder in the File Manager section.
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