What is the main method that Google uses to rank its websites?

google primarily uses its algorithm called PageRank to rank websites. This algorithm evaluates the quantity and quality of links to a page, considering both the relevance of the linking sites and the content of the linked pages. Additionally, google incorporates various factors such as user experience, mobile-friendliness, and content relevance to ensure that the most useful and authoritative sites appear at the top of search results. Regular updates to the algorithm further refine these ranking criteria.