What function do custom event properties serve?

Custom event properties play a crucial role in enhancing the functionality and effectiveness of event tracking within marketing campaigns. By allowing the setting of specific attributes or properties on custom events and purchases, they enable marketers to gather richer, more granular data about user interactions.

For instance, when a user interacts with an application, the associated custom event properties can help capture valuable details such as the type of interaction, the product involved, or specific user behaviors that led to the event. This depth of information aids in understanding user journeys more comprehensively, allowing for better analysis and segmentation for future campaigns.

In contrast, the other options focus on aspects that do not directly pertain to the specific role of custom event properties. While statistical insights and user notifications are important, they don't encapsulate what custom event properties are fundamentally designed for, which is to enrich the data collected during event tracking. Custom event properties do not inherently monitor click frequency, as their purpose is more about assigning relevant data to events rather than tracking metrics directly.