Eukarya is one of the three main domains of life, alongside Bacteria and Archaea. Organisms in this domain are characterized by having complex cells with a nucleus that contains their genetic material. This group includes a wide variety of life forms, such as plants, animals, fungi, and protists. Eukaryotic cells are generally larger and more complex than prokaryotic cells, which belong to the other two domains. Eukarya can be unicellular or multicellular, and they reproduce through various methods, including sexual and asexual reproduction. This diversity allows Eukarya to thrive in many different environments on Earth.