- Sour cream is a dairy product obtained by fermenting a regular cream with certain kinds of lactic acid bacteria.
- The bacterial culture, which is introduced either deliberately of naturally, sour and thickens the cream.
Soured milk is a food product, distinguished from spoiled milk, and is a general term for milk that has acquired a tart taste, either through the addition of an acid, such as lemon juice or vinegar, or through bacterial fermentation.