Data Masking is a method or process which is used for creating a structurally data information similar form and used such as software testing and user training. The purpose is to protect the actual data while having a functional substitute for occasions when the real data is not required. Generally Masking refers to the process of changing certain data elements within a data store so that the structure remains similar while the information itself is changed to protect sensitive information. Data Masking ensures that sensitive customer information is unavailable beyond the permitted production environment. This is especially common when it comes to situations like user training and software testing.