Lactobacillus is a type of beneficial bacteria commonly found in the human gut and various fermented foods. These bacteria play a crucial role in digestion by breaking down sugars and producing lactic acid, which helps maintain a healthy balance of gut flora. In addition to aiding digestion, Lactobacillus is known for its potential health benefits, including supporting the immune system and preventing harmful bacteria from thriving in the gut. It is often included in probiotic supplements and foods like yogurt and kefir, promoting overall gut health.