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Each data object in Pega is connected to a specific source based on where the most reliable and updated data comes from. For example, if customer details are stored in an external system, then the data object uses a REST API to fetch that information in real-time. If the data doesn’t change frequently, like a list of countries or products, it can be stored directly in Pega for faster access. This mapping helps ensure that Pega always uses the most accurate and efficient way to get data. It also improves system performance by avoiding unnecessary external calls when the data can be stored locally. The choice depends on how often the data changes, how critical it is to get the latest value, and where the system of record is.

@AchinthaJ