What are backlinks? To a bigger degree, your backlink profile is formed from backlinks from external sites (also referred to as referring domains) that contribute to the general strength, 

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relevance and variety of your domain’s backlink profile. The total number of backlinks can often include many links from an equivalent referring domain or multiple referring domains. It’s common for referring domains to link back to your content if it's relevant, authoritative or useful in how to their own domain. In a perfect world, that’s how backlinks are accumulated; unique content that other websites want to be related to . Generally speaking, backlinks are considered to be a “vote” of confidence for the content that’s being linked to on your domain from outside sources.