In most events, there are certain instances of a source that represents a referring page, element, or item that lead to the event occurring. An example of an event source could be a product_view_source , which denotes what part of the app lead the user to view the specific product that was viewed.
Event sources provide you with more context into the user journey and exactly where in the app users are interacting in order to perform converting events.
Event Types are various fields that represent different types of interactions that can occur within the app. An example is a search_type, which could include a text search, barcode search, or others. These Event Types provide more context on the interactions occurring in the app and enrich each event with necessary information on the user behavior