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When it comes to SEO, Google’s PageRank (PR), which is the most used SEO ranking metric, is vague and unhelpful. Although most SEOs would agree that it’s an indication of a page’s popularity (or power), it’s unclear why that’s so or exactly how popular a ranked website is.
For example, for a website with a PR of 7 — and as a point of reference, this website has a PR of 6 — most people would assume it’s a popular, and thus powerful, website.
But that’s not always the case, and there are quite a lot of exceptions.