Confidentiality agreement, also called non-disclosure agreement(NDA).
Contracts or confidentiality agreements, is a legal contract between at least two entities to share confidential material or knowledge for certain purposes, but restricting their public use.
We call the letter name a type of message that takes the handwriting form that generates communication between people. The letter was created as a means of building contact between people who saw themselves spatially distant and who in times past without technological resources tried to communicate.
The privacy of a letter is and should always be protected by law. For this reason, the letter is the best option for communicating a confidential and formal record of a transaction.
