Abstract
Archaea, once thought limited to extreme environments, are now recognized as ubiquitous and fundamental players in global ecosystems. While morphologically similar to bacteria, they are a distinct domain of life and are evolutionarily closer to eukaryotes. The development of model archaeal systems has facilitated studies that have underscored unique physiological, biochemical, and genetic characteristics of archaea. Haloferax volcanii stands out as a model archaeon due to its ease of culturing, ability to grow on defined media, amenability to genetic and biochemical methods, as well as the support from a highly collaborative community. This haloarchaeon has been instrumental in exploring diverse aspects of archaeal biology, ranging from polyploidy, replication origins, and post-translational modifications to cell surface biogenesis, metabolism, and adaptation to high-salt environments. The extensive use of Hfx. volcanii further catalyzed the development of new technologies and databases, facilitating discovery-driven research that offers significant implications for biotechnology, biomedicine, and core biological questions.