Order Fucales is a taxonomic classification used to categorize a diverse group of brown algae. This group is commonly referred to as "rockweeds" or "sargassum" and can be found in both marine and freshwater habitats. While Order Fucales is the formal scientific name for this group, there are a number of synonyms that are commonly used, including the families Fucaceae and Sargassaceae. Other informal names for this group include bladderwrack, black tang, and gulfweed. This group of algae is economically important, as they are harvested for use in fertilizers, animal feed, and as a food source for humans.