Apple cider is a sweet, non-alcoholic beverage made from fermented apple juice. It's typically produced by crushing apples and then pressing out their natural juices. The juice is then allowed to ferment naturally through the action of yeast present on the surface of the fruit. This process converts the sugars in the juice into alcohol, producing a mildly effervescent drink that's popular all over the world. Apple cider can be enjoyed plain or as part of a cocktail and is often served warm during colder months.