Sour milk beverage, also known as cultured milk, is a popular drink in many cultures. It contains beneficial bacteria that aid digestion and offer a refreshing tangy taste. While the phrase "sour milk beverage" might not be familiar to everyone, there are various synonyms that describe this drink. For example, it is commonly known as buttermilk in Western countries, kefir in Eastern Europe, and lassi in South Asia. Other possible terms include fermented milk, sour cream milk, and curdled milk. Whatever its moniker, this creamy and tangy drink has remained a staple in many cuisines and is enjoyed for its unique flavors and health benefits.