When it comes to understanding the range of products and how product families fit together Oracle have created some helpful block diagrams, such as the one below.
This really helpful – particuarly when trying to understand potential licensing relationships. However there doesn’t appear to be an equivalent diagram (certainly not on OTN). So after a bit of navigating around OTN we have produced the following diagram:
If you find it useful, help yourself but a nod would be appreciated.