Backlinks, also known as incoming links, inbound links, inlinks, and inward links, are incoming links to a website or web page. In basic link terminology, a backlink is any link received by a web node from another web node.
An outbound-link (OBL) is a link from your website to another website. Outbound links can add value to your site by providing useful information to users without you having to create the content. It is difficult for a single website to be comprehensive about a subject area.
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Links coming from other sites to your site. Like you are getting link to your site from warriorforum.com through signature. (looks like you have an idea about this.
If you place any other website link on your site, it will be treated as Outbound links