An inbound url can be a link from just one website to another web-site. If your company's site included a website link to an short article on the HubSpot website, HubSpot can be acquiring an inbound connection out of your web-site.
In HubSpot, an inbound connection is a hyperlink to some webpage on your internet site from another site that has created at least one visit. You can see how inbound links are building traffic to your website internet pages while in the sources report. Visitors to your site from inbound links are going to be reflected during the Referrals bucket on the resources report (