 A canonical URL is the URL of the page that Google thinks is most representative from a set of duplicate pages on your site.For example, if you have URLs for the same page (for example example.com?dress=1234 and example.com/dresses/1234), Google chooses one as canonical.Note that the pages do not need to be absolutely identical; minor changes in sorting or filtering of list pages do not make the page unique (for example, sorting by price or filtering by item color).