Probiotics are live microorganisms, typically bacteria or yeast, that provide health benefits when consumed in adequate amounts. They are often referred to as “good” or “friendly” bacteria and are commonly found in fermented foods like yogurt, kefir, sauerkraut, and dietary supplements. Probiotics can help maintain or restore the balance of gut microbiota, potentially aiding in digestion, boosting the immune system, and preventing or treating certain illnesses such as diarrhea, irritable bowel syndrome (IBS), and some infections.