What is typically the first step to initiate data ingestion in AEP?

The first step to initiate data ingestion in Adobe Experience Platform (AEP) is to define schemas for the incoming data. In AEP, schemas serve as blueprints or structures that define the format and organization of the data being ingested. They specify the types and formats of data elements, as well as the relationships between them, ensuring that the data aligns with the platform's requirements.

By starting with schema definition, you establish a clear framework for how the data will be consumed and utilized within AEP. This step is crucial because the integrity and usability of the data hinges on proper schema design, which enables accurate data modeling and efficient querying later on.

In contrast, while preparing transformation functions, connecting data sources using APIs, and establishing a user permission framework are all important components of working with AEP, they typically follow the schema definition phase. Transformations might be applied to data post-ingestion, connection setups require schemas to determine how data is structured, and permissions relate more to access control rather than data ingestion directly. Thus, defining schemas is the foundational step that enables the successful ingestion of data into Adobe Experience Platform.