Both prebiotics and probiotics are essential for intestinal health. Each of them plays a role in maintaining the smooth functioning of your digestive system. While probiotics are live strains of bacteria, prebiotics are plant fibers that nourish and support them. Probiotics and prebiotics are available as dietary supplements and can also be found in food. Getting enough of both can support the health and function of your digestive system, immune system, nutrient absorption, and more.