Probiotics are live microorganisms that, when consumed in adequate amounts, confer health benefits to the host. They are typically found in fermented foods like yogurt, kimchi, and sauerkraut, as well as in dietary supplements. Probiotics are believed to help improve digestive health, boost the immune system, and even promote mental well-being. Research in this area focuses on understanding the mechanisms by which probiotics exert their effects, identifying specific strains that are most beneficial for various health conditions, and exploring potential applications in preventing or treating diseases.