Definition: The term "Freyarchaeota" is a genus in the class Eukaryota, which includes bacteria and archaea. It is characterized by its ability to form complex, hierarchical structures with a backbone of DNA, as well as its ability to grow on a variety of substrates including organic matter. The species within this group are known for their unique metabolic activities, such as the fermentation process, which allows them to convert carbohydrates into energy or other compounds.