Although both apple cider and apple juice are made from fresh apples, apple cider is unfiltered, so it is cloudier than apple juice.  This is because of the bits of apple particles that have not been filtered out of it.  Apple juice is filtered and cooked to remove sediment and kill any bacteria. It is clear and has a longer shelf life than raw cider.  Commercial producers have started to pasteurize or add preservatives to apple cider which increases its shelf life and removes any harmful impurities. For more information you can check out this article.