Eukaryote
From Wikipedia, the free encyclopedia

A eukaryote (pronounced /juːˈkæriɒt/ or /juːˈkærioʊt/) is an organism whose cells contain complex structures enclosed within membranes. Almost all species of large organisms are eukaryotes, including animals, plants and fungi, although most species of eukaryotic protists are microorganisms. The defining membrane-bound structure that sets eukaryotic cells apart from prokaryotic cells is the nucleus. The presence of a nucleus gives eukaryotes their name, which comes from the Greek ευ (eu, “good”, “noble” & “true”) and κάρυον (karyon, “nut” & “kernal”). Most eukaryotic cells contain other membrane-bound organelles such as mitochondria, chloroplasts and the Golgi apparatus.

Here’s an example from an animal cell:

Prokaryote
From Wikipedia, the free encyclopedia

The prokaryotes (singular pronounced /proʊˈkæriət/) are a group of organisms that lack a cell nucleus (= karyon), or any other membrane-bound organelles. They differ from the eukaryotes, which have a cell nucleus. Most are unicellular, but a few prokaryotes such as myxobacteria have multicellular stages in their life cycles.[1] The word prokaryote comes from the Greek πρό- (pro-) “before” + καρυόν (karyon) “nut or kernel”, referring to the cell nucleus, + suffix -ώτης (-ōtēs) (pl. -ώτες (-ōtes)).

Here’s an example: