All living things (organisms) are made up of cells. Cells are the smallest unit of life able to carry out the functions an organism needs to stay alive - like eat, breathe and reproduce.
Cells can be broken down into 2 types – prokaryotic cells and eukaryotic cells. Both types of cells have some things in common.
Prokaryotic cells are simpler cells and were probably developed first. Bacteria are prokaryotes.
Eukaryotic cells are more complex and evolved from these simpler cells. These are the cells of plants, animals, fungi and algae.