All Non Disclosure Agreements could be an Agreement but all agreement could not be a Non Disclosure Agreement.An Agreement is formed when one party accepts the offer of the other party, and where both the parties agree to do or not to do the same thing in the same manner as agreed upon. Generally, in an agreement, there is no secrecy as such to be maintained between the parties as it is about the general transaction in a general sense. Whereas, a Non Disclosure Agreement is an agreement where one party agrees to share some confidential information with the other party & the other party agrees not to disclose the same to any third party for a specified period of time.