This area is where the data is consumed from the data warehouse and/or the data lake. This book has a chapter dedicated to data lake. In short, the data lake is composed of several areas (data ponds) that classify the data inside of it. The data warehouse is a part of the data lake; it contains the certified data. The data outside the data warehouse in the data lake is most of the time noncertified. It is used to do ad hoc analysis or data discovery.
The BI part can be stored in relational databases, analytic cubes, or models. It can also consist of views on top of the data warehouse when the data is suitable for it.
