DDG generally has fewer ads and does not track searches across sites; advertising is based solely on what you search for here and not on what you did somewhere else.

Google is a highly efficient, productive and popular service. Google also knows what you previously searched and where you were on the night of January 17, 2017. Thus site-specific results may follow advertising by third-parties seeking to sell you soap, etc., because you happened to mention a common keyword in your Gmail three years ago.