Otherwise known as a Non-Disclosure Agreement, is a legal contract between two or more parties that outlines confidential information, knowledge or material that the parties wish to share with each other for certain purposes, but which must not be disclosed to third parties.

A legal document, usually in writing, giving details of a formal legally binding agreement, between two or more different people or groups. To be legally binding it must contain certain elements: it must contain an offer made by one party and accepted in its entirety by the other, it must include some form of consideration whether it be money, goods or services, and it must be properly signed by all parties to it, and dated.