A eukaryotic cell is defined as a type of cell that contains a nucleus and membrane-bound organelles, distinguishing it from prokaryotic cells. Eukaryotic cells are found in a variety of organisms, including plants, animals, fungi, and protists. Their complex structure allows for compartmentalized functions, enhancing cellular efficiency and specialization. Eukaryotic cells engage in various processes such as cellular respiration and protein synthesis, essential for the growth and functionality of multicellular organisms.