The primary ingredient used to make cider is apples. Cider is produced by fermenting the juice of apples, which can be done using various apple varieties. The type of apples chosen can significantly impact the flavor, sweetness, and acidity of the final product. In some regions, cider may also include other fruits or spices, but traditional cider is usually apple-centric. The fermentation process involves yeasts converting the sugars in apples into alcohol, resulting in a refreshing beverage that can range from sweet to dry, still to sparkling, based on production methods.