today nofllow and dofollow is very important.
google is not follow to some sites and this site is not improve our trafic or website page rank, is called nofollow.nofollow sites backlink is not catch by google.
google us follow to some websites is called dofollow dofollow site is very effictive to increase our traffic.google is catch the backlink in dofollow sites.
so use only dofollow sites.
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