What is the difference between a page group and a value group?

The distinction between a page group and a value group is critical in understanding how Pega organizes and manages data structures.

A page group is designed to hold multiple pages, and while these pages can be considered to be unordered, they can include embedded pages which allow for a hierarchical data structure. This means you can have pages within pages, allowing for complex data relationships. On the other hand, a value group contains single values (like strings, integers, etc.) and is also unordered. Value groups do not allow for embedded structures, hence they can only manage simple data types rather than the more complex types that page groups can represent.

Thus, the correct choice captures the fundamental nature of these two concepts in Pega's data management. Page groups allow for a flexible and complex organization of data through the use of pages, making them essential for scenarios where relationships between different data entities are important, while value groups are limited to holding straightforward single values. This structural difference is crucial for developers in choosing the appropriate data organization method for their applications.