Sour milk or yogurt (in English this word is used for both yogurt and sour milk referred)) as various kinds of milk products made from either fresh milk. Milk, semi-skimmed or soy milk by using bacteria Lae khato Basil lat. El SI a Si station and ropto as well as finlat's Thermo Bacchus entered various fermented milk products. These bacteria help digest milk sugar in the later laektik acid khato. There will be sour and acidic conditions, acid-base is between 3.8-4.6 there are 2 types of yogurt: the first type is a yogurt that looks like water drink. Another type is a yogurt that has liquid concentrate called yogurt.