Vinegar is an aqueous solution of acetic acid and trace chemicals that may include flavorings. Vinegar typically contains 5–20% by volume acetic acid. Usually the acetic acid is produced by the fermentation of ethanol or sugars by acetic acid bacteria. Vinegar is now mainly used as a cooking ingredient, or in pickling. There are many types of vinegar, depending upon the source materials.
As the most easily manufactured mild acid, it has historically had a wide variety of industrial, medical, and domestic uses. Some of these are still commonly practiced, such as its use as a household cleaner.