​Confidential communications between an attorney and client that are made during the course of representation, relates to the representation, and are for the purpose of giving or seeking legal advice, is considered "absolutely" privileged, meaning not even the court can order they be disclosed.  This is much different than the Work-Product Doctrine, which only provides "qualified immunity" to materials containing opinions and impressions made in anticipation of litigation, and not in the ordinary course of business.  There are a number of exceptions, and both privileges can be waived, so it is important to seek the advice of an attorney prior to creating documents or disclosing information that could relate to a legal proceeding.