Backlink
A link from another website pointing to the site or page being evaluated.
Definition
Backlinks are one of the core signals search engines use to judge a site's authority and trustworthiness. A domain's backlink profile - the number, quality, and diversity of sites linking to it - underlies metrics like Domain Authority and Domain Rating.
When evaluating a domain or website listing, buyers should look past the raw backlink count to the quality of linking sites and whether the profile shows any history of spam-link building, which can carry risk after transfer.