How does PageRank work?
PageRank (PR) is a calculation, invented by Google founders Larry Page and Sergey Brin, that evaluates the quality and quantity of links to a web page to determine a relative score of the page's importance and authority on a scale of 0 to 10.
Does PageRank no longer exist?
Google no longer displays the PageRank score for websites. It used to appear at the top of browsers directly in the Google Toolbar, but no longer. And PR data is no longer available to developers via the API. Even though it is now hidden from public view, PageRank is still an important ingredient in Google's secret ranking algorithms.
PageRank does not guarantee high rankings
Because Google wants to return to a high-quality, relevant, and reliable result, it can return web pages with better PageRank scores higher up in the SERPs, even if PageRank is just one of many ranking factors considered. Since PageRank is just one factor in the Google ranking algorithm, it's important to remember that a high PageRank does not guarantee high rankings - but it can be helpful.