Apple cider vinegar is the type of vinegar (liquid consist 5-20 % acetic acid, water, and other trace chemicals, which may include flavorings) made from apple must (freshly pressed apple juice which contains skin, seeds, and stems of the fruit).
Bacteria and yeast are added to the liquid to start the alcoholic fermentation process and the sugars are turned into alcohol then the alcohol is converted into vinegar by acetic acid-forming bacteria.
It has medium pale to amber (between gold and orange) color, sour in taste and has a very strong smell.