Laura,
Most people would agree that mySQL is a relational database.
What many people don't probably relaize is the underlying datastore is
not-fixed.
mySQL can use any of a number of db's to do it's I/O, and relational
datastore. mySQL is a relational interface or layer to true db's data
stores.
They even now have their own.
Wait? What's the difference? Free! Free! Free! SQL! SQL! SQL!
Have you ever heard of EDA?
Unidata/Universe can be middleware to many db's.
Take this psuedo diagram:
Unidata/Hashed Tables
----------
mySQL
---------
db's?
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