This page discusses the reclassification of Archaea from bacteria to a separate domain due to their genetic similarities with eukaryotes. These extremophiles thrive in harsh environments, with key gro...This page discusses the reclassification of Archaea from bacteria to a separate domain due to their genetic similarities with eukaryotes. These extremophiles thrive in harsh environments, with key groups like Euryarchaeota and Crenarchaeota that exhibit unique traits. Their biochemical properties are of interest for biotechnology applications, particularly in utilizing their enzymes, which are effective in extreme conditions.