Cider
Cider is an ancient beverage. No-one knows when or where it was first made, because the native distribution of its principal component, the apple, is so widespread, from the Near East to Northwestern Europe. In the cider market, ciders can be broken down into two main styles, standard and specialty. The first group consists of modern ciders and heritage ciders. Modern ciders are produced from culinary apples such as Gala. Heritage ciders are produced from heritage, cider specific, crab or wild apples, like Golden Russet. Historically, cider was made from the only resources available to make it, so style wasn't a large factor when considering the production process. Apples were historically confined to the cooler climates of Western Europe and Britain where civilization was slow to develop record keeping. Cider was first made from crab apples, ancestors of the bittersweet and bittersharp apples used by today's English cider makers.
Cider
Fermentation of ciders occurs by a very similar mechanism to the fermentation of wine. The process of alcoholic fermentation is characterized by the conversion of simple sugars into ethanol by yeasts, especially "Saccharomyces cerevisiae". This is because, as “Crabtree positive” yeasts, they produce ethanol even during aerobic fermentation; in contrast, Crabtree-negative yeasts produce only biomass and carbon dioxide. This adaptation allows them a competitive edge in the fermentation of ciders due to their high alcohol tolerance, and because of this tolerance, it is common for ciders to be fermented to dryness, although that is not always the case. Fermentations will carry on until the yeasts run out of nutrients and can no longer metabolize, resulting in a "stuck" fermentation, or the fermentation is stopped.