Prokaryotic and Eukaryotic Cells.
Prokaryotic cells are the simplest (arguably) cells, in being that they have many less organelles inside.
Prokaryotic cells have a cell membrane, DNA, ribosomes, and a few other things.
Eukaryotic cells, on the other hand, are much more complex. They have many organelles, such as the endoplasmic reticulum, vacuoles, the golgi apparatus, and others.