WHAT IS YOGURT?
Yogurt also spelled yoghurt, yogourt or yoghourt, is a dairy food made by bacterial fermentation of milk. The bacteria used to make yogurt are called "yogurt cultures," which ferment lactose, the natural sugar found in milk.
Yogurt is made as fresh milk or cream. Yogurt is always pasteurized at the beginning, then fermented with various live bacteria cultures. After that incubated at a specific temperature to encourage bacteria growth.