Cider (/ˈsaɪdər/ SY-dər) is an alcoholic beverage made from the fermented juice of apples.In the US and some parts of Canada, "cider" refers to unfiltered apple juice, traditionally made with a distinct sweet-tart taste. "Hard cider" is used for the fermented beverage.The juice of any variety of apple can be used in cider making, but cider apples are best.