Suppose I add a hyperlink from a webpage to a webpage . In principle, adding that single hyperlink changes the PageRank not just of those two pages, but potentially of nearly every other page on the web. For instance, if the CNN homepage http://cnn.com adds a link to the homepage of my site, https://michaelnielsen.org, then not only will that increase the PageRank of my homepage, it will also increase (though in a smaller way) the PageRank of pages my homepage links to, and then the pages ...
