If your link putted to other websites with the "NoFollow", "NoFollow" prevents search engines to be index your site. But this way still generates traffic to your site.
Thanks guys! At first I thought "No Follow" would prevent the spider to crawl a certain page, however, I know now that the page will eventually be crawled however not giving any juice to that page. Thank you guys for sharing.
Yep, if you want to prevent the spiders crawling a page, then you use disallow in the robots.txt file .
Site A links (nofollow) to Site B. Site A: PR is not influenced in ANY way. Site B: PR is not influenced by the nofollow links from site A.