A non-disclosure agreement (NDA) is an agreement between two parties to protect sensitive or confidential information, such as trade secrets, from being shared with outside parties.

An NDA is a formal legal agreement between two or more parties undertaken by the parties to keep information shared or provided by one party to another confidential. NDAs are utilized where parties become privy to confidential and / or sensitive information, which the disclosing party desires not be made available to third parties or the general public. Such agreements may also include the confidentiality of the relationship in existence between the parties.