Difference of links

The term "external link" really doesn't mean anything. Or everything. It could be a link from your domain to another domain or vice versa. But most often, SEOs consider external links to be the same as backlinks.......

Let's say that you have website A, with the domain aaa.com ...

    Any link that points to a page within website A is a backlink (at least it is from YOUR point of view). These links could come from other websites, but also from within website A.
    Any link from website B pointing to website A is an inbound link. Some people would also call it an "external link", but like I said earlier, that term is a bit ambiguous. Inbound links form a subset of backlinks.
    Any link from website A pointing to website B is an outbound link.
    Any link from website A pointing to website A is an internal link. Most internal links are actually navigation links or nav links. These are also backlinks, but not as powerful as inbound links.
    Any link in the categories mentioned above can -- at the webmaster's choice -- be turned into a nofollow link. In that case, Google sees little or no value in it for SEO purposes. No so-called "link juice" is passed. Nofollow links have the attribute rel="nofollow" in the code.
    Any link that doesn't have the nofollow attribute -- be it intentionally or accidentally -- is considered a dofollow link. These have direct and often positive impact on your Google rankings, even if they are internal links.



Hope I'm making sense