Simply Do Follow means Google will count this link in its algorithm , No Follow links don't give any weight to where they are pointing. You will want as many relevant Do Follow links as possible pointing to your site, in the most natural way possible of course.
I have seen this thread a hundred times before. to answer your question, it is a back link that is counted by google. You could know if a site is a dofollow or not by looking at the source code.
do follow means google crawling robot will follow that link as back link, and also it will be helpful as back link. do follow links help in ranking as per google link back counting also.
If a link is dofollow , then the target will be having some value for that link in search engine results .
Hi, In Google Page Rank Update no-follow link count as useless, To know more about no-follow or do-follow http://googleblog.blogspot.com/2005/01/preventing-comment-spam.html
It just a normal link which passes PR to your website. It doesn't contain rel="nofollow" or rel="external nofollow" in link code.
Actually, it is about shifting PageRank. PageRank is a patented algorithm that was originally proposed by Larry Page, and it's a means of ranking the "authority" of a page. By definition, PageRank is the statistical probability of a random searcher (for prob/stat fans, the "wandering drunk") stumbling upon a given page on the internet. Pages on the internet are connected by links, and so each link to a site would give it a certain boost in PageRank. And the more pages that link to the page, the higher PageRank it will have (and the higher PageRank that it will pass on to the pages it links to). Think of it this way - PageRank is basically a system for counting "votes" from around the web. Ok, now that we've got THAT out of the way! Because of this effect of incoming links spreading/building PageRank, spammers started turning to blog comments to build up TONS of links to whatever sites they wanted. Now while it IS possible (Google denies it, but testing proves otherwise) that enough links from "bad neighborhoods" can cause ranking problems on your site, it is rare. They try not to hold you accountable for sites that link to you. However, they DO hold you responsible for sites that you link out to. This became a big problem for blog owners, as they were getting smacked upside the head with all of this blog comment spam, and it was negatively impacting the blog's rankings, because it looked like they were giving "votes" to these spammy/deceptive sites. Because of this, the "nofollow" attribute was born. the nofollow tag is a way to tell Googlebot not to follow a link on your page. Now while some testing shows that they actually may still follow the link for indexing purposes, they won't count that link as a "vote" from your page. Now by default, basically all blogs have nofollow enabled for blog comments. However blog owners do have the option of turning that off (making the links "dofollow" - so there's the answer to your question. And it only took THIS long! lol). Having "dofollow" links encourages people to leave blog comments, however you have to be more careful in moderating your blog's comments. ***BONUS*** Years ago, when SEO pioneers like Leslie Rohde picked up on how incoming links were creating/affecting PageRank (and these pages subsequent ability to rank for their wanted search terms), they started manipulating how PageRank would flow through their site. As a for instance, the homepage of almost any site will have the highest PageRank of any page on their site (it's where most of its incoming links are pointed to), and so each of the pages that your homepage links to have PageRank flowing to them from this high PageRank source. From there, think about run-of-site links (links on every page of your site) - pages like your "contact us," "about us," "terms and conditions," etc. that were getting links from EVERY page on your site (including the homepage, with it's higher PageRank), and next thing you know, you're building up pretty high PageRank on your about, contact, terms/conditions, etc. pages. None of those pages make you any money, and so you're essentially wasting PageRank on them, when you could be sending that PageRank to your money pages (pages with product, or whatever you're selling). Old school SEOs used to use Javascript links to accomplish this, as seach engine crawlers don't do well with Java (especially back then), but once the nofollow attribute was born, SEOs were able to start using it to "sculpt" PageRank on their sites. And for the record, Google has stated that they are ok with the practice.
Do-follow is a one solution feature during receiving position on top of most important Search Engine.