Both cell types have vacuoles—basically tiny storage tanks. Plant cells, though, have one huge central vacuole that takes up most of the room. It’s like a walk-in closet for water and nutrients.
Animal cells have multiple tiny vacuoles, like a bunch of fanny packs. They store stuff, but they’re not show-offs. A plant’s vacuole also helps keep the cell rigid—filled with water, it pushes against the wall.
Empty that vacuole, and your plant goes all droopy. You’ve seen a sad, thirsty fern, right? It’s basically a cellular tantrum.