Dofollow refers to links that do not have nofollow attribute. It is recognized as a vote and the link will be crawled by the search engine spiders. If the link is dofollow, the page rank of the webpage can be transferred into your site. Links with nofollow links are less likely to be crawled. No follow simply means that the webmaster does not want to have anything to do with the link.
The dofollow and nofollow attributes are originally created by Google to reduce the amount of spam in the blogging community. Before it was implemented, many people like to leave their links in the comment body while commenting on the blog posts. The amount of spam is so overwhelming that it cause problems for the blog moderator. Google created the dofollow/nofollow terms so that the moderators don't have to worry about the link juice of their page flowing out to unrelated websites.
Since the implementation of nofollow, the amount of spam comment has greatly reduced. To determine if a site is dofollow, you simply right click on the link. When the right click menu pop up, you should select Properties. If the Properties dialog box state new_window, open in new window or dofollow, it indicates that it is a dofollow site. If it states nofollow or external nofollow, it means that it is nofollow. Another more accurate method is to install the Mozilla Firefox NoDoFollow addon. The Mozilla Firefox NoDofollow add on will highlight the dofollow and nofollow link in separate color.
To reap the maximum benefit, make sure you submit to a dofollow site. If you submit to a nofollow site, your backlink will never be indexed. If the backlink is not indexed, it will not be counted as a vote for your site. Therefore, it is important that your link is dofollow so that it does get indexed by the search engines.
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