Undisclosed source is a term that is commonly used in journalism and other fields to refer to information or data that is obtained from an unknown or anonymous source. Other synonyms for undisclosed source include anonymous source, unattributed source, unnamed source, confidential informant, and secret source. While these terms all refer to the same concept, they may be used in different contexts depending on the type of information being discussed and the source of the information. For example, anonymous source may be used to refer to a whistleblower who is unable or unwilling to reveal their identity, while confidential informant may be used in legal contexts to refer to someone who provides information to law enforcement agencies.