Streptococcus thermophilus is a type of bacteria commonly found in dairy products like yogurt. It is known for its ability to ferment lactose and produce lactic acid, which gives yogurt its tangy flavor. Some synonyms for Streptococcus thermophilus include Lactobacillus thermophilus, Streptococcus salivarius subsp. thermophilus, and Thermophilic streptococcus. These bacteria are often used in yogurt and cheese production as a starter culture, as they help to acidify the milk and create a consistent texture in the final product. Streptococcus thermophilus has also been studied for its potential health benefits, including improving digestive health and boosting the immune system.