This section describes the rules around the Anaplan Engines. 

At the heart of Anaplan is the Hyperblock in-memory engine, which combines the cell-based flexibility of a spreadsheet, the scalability and querying capabilities of relational databases as well as the calculation/aggregation abilities of multidimensional cubes.

Anaplan offers two different engines, Classic and Polaris.  Both are powerful, but they work differently in that Classic focuses more on "dense" solutions while Polaris focuses on "sparse" solutions.  Both work together and we often see a mixture of both engines within a customer's tenant.