Chaka

Strained yogurt, Greek or Greek-style yogurt, yogurt cheese, sack yogurt, kerned yogurt or labneh is yogurt that has been strained to remove most of its whey, resulting in a thicker consistency than normal unstrained yogurt, while still preserving the distinctive sour taste of yogurt. Like many types, strained yogurt is often made from milk enriched by boiling off some water content, or by adding extra butterfat and powdered milk. In Europe and North America, it is often made from low-fat or fat-free cow's milk. In Iceland a similar product named skyr is made. Strained yogurt is usually marketed in North America as "Greek yogurt" and in the United Kingdom as "Greek-style yoghurt", though strained yogurt is also widely eaten in Levantine, Eastern Mediterranean, Middle Eastern, Central Asian, South Asian, and Eastern European cuisines, where it is often used in cooking, as it curdles less readily when cooked. It is used in a variety of dishes, cooked or not, savory or sweet. Straining makes even non-fat yogurt varieties thicker, richer, and creamier than unstrained. Since straining removes the whey, more milk is required to make strained yogurt, increasing the production cost. In Western Europe and the United States, strained yogurt has increased in popularity compared to unstrained yogurt. Since the straining process removes some of the lactose, strained yogurt is lower in sugar than unstrained yogurt.

Source: Wikipedia