A **[[Non-Disclosure Agreement|Non-Disclosure Agreement (NDA)]]** or *Confidentiality Agreement* is a legal [[Contract]] that requires involved parties to keep certain information between them confidential. ^about They primarily serve to protect the involved parties from harm and loss of competitive advantage by preventing the interests, proprietary information, trade secrets, and other sensitive information, required and operated upon in the carriage of [typically] another contract, from becoming known or knowable by the public, and in particular, market competitors.