Type of backlink: Dofollow or Nofollow.

DoFollow is simply an internet slang term given to web pages or sites that are not utilizing "NoFollow." NoFollow is a hyperlink value that tells search engines not to pass on any credibility or influence to an outbound link. Originally created to help the blogging community reduce the number of inserted links into a "comment" area of a blog page, the attribute is typically standard in blog comments. It helps overwhelmed webmasters disallow spammers from gaining any kind of advantage by inserting an unwanted link on a popular page.

Both dofollow and nofollow links are good for seo but dofollow links help to get high PR.

Do follow link is crawled by the spiders , this kind of link pass the value to the spiders . But in No follow , Spiders not crawled . So you get only traffic benefits . Both the link are valuable for websites . most of the bookmarking sites work on no follow links .......

Do follow backlinks is very important then No follow link because Do follow link crawl easily by google spider and this type of link counted as a backlinks also.

do follow links are much more helpful compare to no follow.

dofollow links are good for seo. These do follow links are helps to improve your keyword ranking as well as your website traffic

According to discussion you all are saying that do follow and no follow both are best. but i am not agree with some of you because all of you saying the same thing. just discuss the thing where you have resurch thanks and dont mind...

For Google always create do follow backlinks while for other search engine they always count do follow as well as no follow links.

this two helps in page rank and traffic of the website..