What is do-follow and no-follow?

[e07.net]

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[ldcdc]

This should explain it better than I ever could: http://en.wikipedia.org/wiki/Nofollow

[larry05]

Do follow means to follow the links. No Follow means not to follow the link. So, if do follow links are backlink build then you can achieve SERP Ranking faster.

[khan85]

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DoFollow Link is that the DoFollow Link has a special HTML Markup inside that tells the Search Engines like Google to FOLLOW the destination inside the link.
NoFollow Link has a special HTML Markup inside that tells the Search Engines like Google to NOT FOLLOW the destination inside the link.

[ldcdc]

Actually, if you don't mark a link as nofollow, it is assumed to be dofollow.

[Yesceeohhh]

Do-follow: Search engine crawlers crawl the whole content on your webpage including images,links,keywords etc.Whenever they find a link,if the link is dofollow link then the crawlers follow the link and land on other webpage.If you want to get indexed in google and rank high on google then you have to focus on these dofollow backlinks.

No-Follow: Nofollow backlinks are ignored by search engine crawlers.Whenever you are linking to any website which is not of high value then use rel="nofollow" attribute in your html of the webpage.