Both active and passive transport are ways in which cells get their nutrients from the extracellular fluid. However, they differ in how the cell obtains its nutrients. In active transport, nutrients go against the concentration gradient, from low concentration to high concentration using energy to drive an ion pump.
In passive transport, nutrients flow naturally down the concentration gradient . They flow from high to low concentration. This process does NOT require energy. There are 3 types of passive transport; osmosis( water only) diffusion, and faciliated diffusion.