Quark is a type of fresh dairy product, common for the cuisines of German-speaking countries (Germany, Austria, Switzerland), northern Europe (Denmark, Estonia, Finland, Latvia, Lithuania, Norway, Sweden), the Netherlands, Hungary, Israel, of Slavic peoples (e.g. Czechs, Slovaks, Poles, Russians, Ukrainians and Belarusians), and of Ashkenazi Jews. It is made by warming soured milk until the desired degree of coagulation (denaturation, curdling) of milk proteins is met, and then strained. It can be classified as fresh acid-set cheese, though in some countries it is traditionally considered a distinct fermented milk product. Traditional quark is made without rennet, but in some modern dairies rennet is added. It is soft, white and unaged, and usually has no salt added.