Sourmilk cheeses are a type of cheese made from milk that has acidified and soured naturally, rather than through the use of specific culture strains. These cheeses are known for their tangy and slightly sour flavor, which pairs well with crackers and breads. Some synonyms for sourmilk cheeses include acid-set cheeses, cultured curd cheese, and whey cheese. Acid-set cheeses are made by allowing milk to sour naturally in a warm environment, while cultured curd cheeses use specific bacterial cultures to achieve a similar effect. Whey cheese is made from the leftover whey after other cheeses have been made, which is then soured and turned into a unique type of cheese.