Members are the customers or other end-users who sign up to receive your e-mail marketing messages. At a minimum, each Member has an e-mail address. You can also define other profile fields for Members, such as name, address, phone number, or any other information you wish to capture. You can also define Tags for Members. Members can also subscribe to Lists, and if your Enterprise Site has more than one List, then a Member may choose to subscribe to multiple Lists. Because a Member's record is not deleted when he or she unsubscribes from one of your Lists, you may also have Members of your Enterprise Site who are not subscribed to a List.