What RESTful Application Programming object contains only fields required for a specific app?

A Projection view is designed specifically to contain only the fields that are necessary for a specific application or use case. In the context of RESTful Application Programming, this allows developers to optimize data retrieval and service responses by minimizing the amount of unnecessary data being sent between the server and client.

This is particularly important for performance and efficiency as it reduces the payload size, and can help ensure that the application only processes relevant information. Projection views provide a simplified way to expose only the fields needed, making them ideal for applications where only a subset of the data is needed for a specific functionality.

On the other hand, while a Database view provides a way to present data from one or more tables as a single table, it does not specialize in providing a tailored subset of fields for specific applications. Metadata extension focuses on enhancing the definition of existing data models rather than filtering fields, and a Data model view generally refers to a broader representation of the data structure rather than a focused selection of fields for a particular application.