difference and effects of dofollow & nofollow

If the link is dofollow search engine will crawl the link/page and if the link is Nofollow search engines will not crawl that link.

Speaking about Goggle, i think both dofollow and nofollow links are crawled, but in case of nofollow ones Goggle do not transfer the PR influence

very nicely explained... greatful to all of ya'

If its dofollow the link will count as backlink and if its no follow it won't count.

I agree with Rayz.Mario.

The difference is only that but it matters a lot.

I would like to get some more difference between nofollow and dofollow.

When a webmasters places a link to your site they can do it in two different ways. They can place either a DoFollow link or a NoFollow link. If they choose to place a DoFollow link to your site then you will receive their vote and that will improve your ranking. But if they use the NoFollow link then you will not receive any vote and your ranking will stay the same. Remember, it will not decrease your ranking but the backlink will simply not count.

Nofollow are for not crawling a link by search engine. Dofollow allow search engine to crawl links. Nofollow tag we can use if we are using a link for reference not for crawl. But both are good for human traffic.

Dofollow is good and nofollow is not so good for link building.

make sure that the site is a do follow so that you will not waste your time