I haven't heard of hops being used in cider making, but maybe they are used somewhere? But yeast is involved in any fermentation process. You could make both c

I haven't heard of hops being used in cider making, but maybe they are used somewhere? But yeast is involved in any fermentation process. You could make both cider or wine without adding any external yeast, but then you have a high chance of getting the wrong bacteria and messing it up. So almost everyone uses commercial yeast to start.