Apple cider vinegar is a type of vinegar made by the fermentation of apple cider. During this process, sugar in the apple cider is broken down by bacteria and yeast into alcohol and then into vinegar. Apple cider vinegar contains acetic acid (like other types of vinegar) and some lactic, citric and malic acids.

Unlike white vinegar, apple cider vinegar is a light yellow-brown color. Unfiltered and unpasteurized apple cider vinegar is sold in health food stores, online and in some grocery stores.