[Martin95]

    I am interested in knowing!

    Thanks a millions in advance...

    Best Regards

[Gay]

Do-follow - links followed by some Search engines. (Links that matters)
No-follow - the opposite.

[SEO]

 Hi, Martin95 ! The important is to know NOFOLLOW. Then you will know what is DOFOLLOW. Let's make it clear:

nofollow

is a value that can be assigned to the rel attribute of an HTML a element to instruct some search engines that a hyperlink should not influence the link target's ranking in the search engine's index. It is intended to reduce the effectiveness of certain types of search engine spam, thereby improving the quality of search engine results and preventing spamdexing from occurring. For more: http://en.wikipedia.org/wiki/Nofollow

[PageRank]

 This is the topic, which Mr. Internet wanted to link to the other DO- and NO-follow one.

[PageRank]

I will link them:
http://www.seo-forum-seo-luntan.com/seo/what-is-do-follow-and-no-follow-1039/

[heenakapoor]

no-follow and do-follow both are html tags, which are use for show your link status. If you target Google then both are matter. In Google, if you build backlinks help to increase Link juice of your website, which is most important factor for increase the ranking and Page rank of your website, called do-follow links. If they don't take participate then they called no-follow backlinks and in Google, no-follow links are waste of time.
If you target other search engines then both are same and both type of backlinks help to increase the ranking of your website.

[jeweling]

I found these kind questions in almost all seo forums.I don't know why?

[MSL]

  Because they have to post something in order to get links, I think 

[appdeveloper]

Well, I believed that the Google consider do follow link but not no follow.

[briancowen1097]

Do follow and no follow, both are the types of back-links and Google always give the priority for do-follow links.

[Newpyramid]

Do-follow links are useful to rank your web sites because they are indexed by search engines. But the search engines don’t index no-follow links.

[appleer]

Do-follow - links followed by some Search engines. (Links that matters)
No-follow - the opposite.
i agree with the up opinion!

[constructionhelpline]

Robots can crawl on the Do-Follow links but can't on No -Follow. Do-Follow links are more valuable.

[yanbi07]

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.

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.

[anongwong01]

Dofollow and no follow is a condition which you can use on your website for website crawler. Do follow links crawler follow while no follow, crawler never follow.