Prokaryotic cells are bacteria and lack the complexity of eukaryotic cells because they have no internal membrane, and therefore no nucleus or organelles. They can be rod shaped, spherical or spiral.
Eukaryotic cells are more complex because they have a nucleus and other organelles, like vacuoles or mitochondria.
Prokaryotes are found in the Kingdom Monera. Eukaryotes are found in the Kingdoms Protista, Plantae, Fungi and Animalia.
Plant cells are responsible for making their own food through photosynthesis so they have chloroplasts; they also have a cell wall which helps them keep a rectangular shape.
Animal cells do not have a cell wall or chloroplasts but do have lysosomes, or organelles containing digestive enzymes. Unlike plant cells that have one large vacuole that takes up most of the cell, animals cells are round and have multiple, smaller vacuoles.