Greek yogurt is a yogurt that has been strained to remove most of its
whey, resulting in a thicker consistency than unstrained yogurt, while
preserving yogurt's distinctive sour taste. Like many types of yogurt,
strained yogurt is often made from milk that has been enriched by
boiling off some of its water content, or by adding extra butterfat and
powdered milk. In Europe and North America, it is often made with
low-fat or fat-free yogurt. In Iceland a similar product named
skyr is produced.