nofollow is an attribute of the HTML tag value. This tag is to tell the meaning of search engines do not track the links on this page "or" do not track the specific link.
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1.nofollow tag is an attribute of the hyperlink value, we only need to add rel= source code "nofollow" or the more formal "rel= external nofollow" to: ###
2. will be "nofollow" written in the meta tags on the page, used to tell the search engines don’t grab all external and internal links page.