What are tasks of the ABAP Core Data Services?

The primary function of the ABAP Core Data Services (CDS) is to define views on the database. This allows developers to create a semantic layer on top of the database tables, enabling the representation of complex data models in a more manageable and understandable way. CDS views leverage the power of the underlying database while providing a way to integrate data from multiple tables into a single logical view. This abstracts the data access layer and enhances performance by utilizing database capabilities, such as filtering and aggregating data.

In contrast, the other options do not represent the core function of CDS. For instance, providing services for classical ABAP user interfaces pertains more to the overall ABAP programming framework rather than a specific task of CDS. Defining tables on the database is performed through Data Dictionary objects, not CDS. Lastly, the definition of Business Objects in the ABAP RESTful application programming model relates to a different aspect of application development within the ABAP environment rather than the purpose of CDS.