Prokaryotes:

Prokaryotes have only a limited number and types of organelles in their cells. They are made up of simple cells which lack membrane-bounded organelles e.g. mitochondria, and the Golgi complex.

Eukaryotes:

Eukaryotes have a large number and types of organelles in their cells. They are made up of complex cells which have membrane-bounded organelles. A cell membrane (outer covering of cell) is however present in all cells, whether prokaryotic or eukaryotic.

In the case of bacteria and most protists, the entire organism consists of a single cell. In the case of most fungi, animals, and plants, the organism consists of up to trillions of cells.