Double dry hopping refers to the process of adding hops in two separate stages during the brewing process to enhance hop aroma and flavor. In contrast, a Double IPA (also known as an Imperial IPA) is a beer style characterized by its high alcohol content and intense hop flavor, resulting from using more hops and malt during brewing. It's possible for a Double IPA to be double dry hopped, but not all double dry hopped beers are Double IPAs.