The origin of the eukaryoticcell was a milestone in the evolution of life.
Although eukaryotes use the same genetic code and metabolic processes as prokaryotes, their higher level of organizational complexity has permitted the development of truly multicellularorganisms.
Eukaryotes (also spelled "eucaryotes") comprise animals, plants, and fungi—which are mostly multicellular—as well as various other groups that are collectively classified as protists (many of which are unicellular).
Eukaryotes share a common origin, and are often treated formally as a superkingdom, empire, or domain.
Eukaryotes are closely related to archaea, at least in terms of nuclear DNA and genetic machinery.