Google’s algorithm that gives every webpage a score showing how important and authoritative it is relative to other, related pages on the internet. It takes into account the quality and quantity of the links to that page from other pages. Google gives each page a public-facing score from 1-10, but it’s possible for pages to accumulate more points than that if they have strong link profiles (i.e. plenty of links to that page from other, authoritative internal and external pages). The quality of links to a page is increasingly important (rather than the quantity of links).