What class in a Pega application describes the interaction with external systems?

The class that describes the interaction with external systems in a Pega application is the integration class. This is a specialized class designed to handle data exchange and communication with external systems, such as databases, web services, or APIs.

Integration classes often contain data pages, activities, and other components required to perform operations like retrieving, updating, or deleting data in external systems. By organizing these interactions within an integration class, Pega applications can efficiently manage and encapsulate the logic necessary for communicating with external resources, promoting better maintainability and separation of concerns.

In contrast, the data class primarily focuses on representing data structures and business entities within the application, while the work class is designed for managing work items and processes that flow through the application. Lastly, the ruleset class is associated with grouping rules and components in Pega, which helps in organizing and deploying application functionalities but does not specifically manage external system interactions.