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No-follow link is exactly vice-verse of do-follow link. these are non-crawling link which are not passed by search engines bot and hence can't be cached or indexed. it is obvious when we wish to prevent a link from crawling and indexing.
Do-follow link is a kind of hyperlink which says all search engines crawlers to pass through which also put an impact over page rank. when we opt to employ or attempt to achieve a do-follow link then is counted by search engines and sits in the eye of google, bing, MSN, YAhoo etc. as a backlink for your website and enhances your site ranking.
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