Eukaryoten, or eukaryotes, are organisms whose cells contain a nucleus and other membrane-bound organelles. 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 lack a nucleus. Eukaryoten reproduce in various ways, including sexual and asexual reproduction. They can be unicellular, like yeast, or multicellular, like humans. The presence of a nucleus allows for more complex processes, such as cell division and gene expression, making eukaryotes essential for the diversity of life on Earth.