This figure illustrates the data flow between the various elements of CGNS. On the left is a box representing the CFD application. It's connected by an arrow, pointing in both directions, to a box labeled "API" representing the CGNS Application Programming Interface. A box labeled "Internal Data Representation" is connected to the API, also by a bi-directional arrow. The API is also connected by bi-directional arrow to a box labeled "ADF Core" representing the ADF database management routines, and the ADF Core is similarly connected to a box labeled "Storage Media" representing the file containing the CGNS database.