Q: Introduce NDA in General Prospect ?

Ans: Non disclosure agreement is an agreement to protect the intellectual property.  The researchers, startup companies and anyone who would like to work with some another person and would like the another person not to share his intellectual property to anyone would have the requirement of non disclosure agreement in order to make his intellectual property confidential and to protect his intellectual property from sharing with others by the person from whom the intellectual property is shared.  

The agreement of non disclosure is required in partnership, hiring employees,  etc.  Non disclosure agreement establishes confidential relationship between two persons.