As the word Schema is quite popular in the RDBMS world, let us take a minute to assess what Schema is. By definition, Schema is one of the many different types of structured data used to leverage the data carrier across multiple layers of enterprise application.

In simple terms, Schema is the skeleton of the data structure to be used in an enterprise application. As an example, a banking application might represent the customer details in some prescribed layout, which is termed as Customer schema of the banking application. In the RDBMS context, a predefined structure is essential for efficient database management in the storage layer. Also, it helps to build and search the relationship between the different objects of the underlying database tables.