Inbound is nothing but a backlink that is linked on another site and there visitors are coming to your website. It means visitors are coming to your site from other sites through your links. It is inbound.
On the other hand, when visitors are going from your site to other site, it is called outbound link. It is also a kind of backlink, when you are linking another site’s URL in your website and your visitors found the link relevant and going outside of your website to another site. It is an outbound link.
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