Plantae is the kingdom that contains organisms commonly referred to as plants. Similar to animals, plants are also multi-cellular eukaryotes. Organisms within Plantae have cell walls containing cellulose and their cells also contain chlorophyll. They also tend to be autotrophs that typically use photosynthesis to create energy (food) for themselves. However, there are some parasitic and carnivorous plants that don’t rely, or don’t fully rely, on photosynthesis that still are classed within Plantae.