A Confidential Disclosure Agreement (CDA) is a type of contract between two or more parties that obliges them to keep certain information confidential and not to disclose it to any third parties. The agreement is typically signed by the parties prior to the disclosure of confidential information. A Joiner to Confidential Disclosure Agreement is a document signed by a third party who joins with the parties to a CDA and agrees to comply with the terms and conditions of the agreement. Common types of Confidential Disclosure Agreement include Non-Disclosure Agreements (NDAs), Mutual Non-Disclosure Agreements (Midas), Proprietary Information Agreements (Bias), and Material Transfer Agreements (MTA). A Joiner to Confidential Disclosure Agreement can be used to add additional parties to the agreement, such as employees, contractors, or vendors who will have access to the confidential information.