Step 2.30: Follow Vs Nofollow
Basic Concepts | Off-Page SEO Components | Backlinks
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The ‘nofollow’ tag is code that’s attached to a link, that determines whether authority passes through the link.
By default, all links are ‘follow’ links, unless the attribute known as ‘nofollow’ is added to a link. The nofollow attribute prevents authority from passing through the link. This removes the primary benefit of the link.
That said a nofollow link is still a promotion of sorts and can send traffic to your site, as well as constituting a part of your link neighbourhood.
You do not want many nofollow links within your backlink profile, although a few will make it look more natural.
When looking for places to acquire links, look at the site’s linking policy or try to determine it from the way they link out to other sites. If they link to all external resources with a nofollow tag, it might not be a great place to get a link from.