A Nofollow link refers to backlinks that tell the search engines to not go any further, hence “nofollow”. By adding the no follow tag in a backlink, these links don’t transfer link juice. Remember that link juice is what determines Page Rank, and the more link juice you have, the higher the page rank a page has. Nofollow links were originally made to stop spamming in blog posts, because users would be able to spam blogs with links back to their site that would transfer link juice, and this was abused shortly after its introduction. Nofollow links aren’t isolated to just blog posts though; nofollow links can be found in certain article directories, and anywhere a webmaster wants to put them. Any URL or link added to Wikipedia that is outbound is a no follow link. Wikipedia offers one of the top places to get a quality nofollow link, and if you pull it off and get one on their site, it can be very rewarding. The link is not only trustworthy in Google’s eyes, but also provides a decent amount of traffic (I’ve had links in average Wikipedia pages provide 50 visitors a week per link).