Good question. If you know a little bit about the system, catalog, and DMV's on SQL server the answer was easy.
Looking at the answers given, I think several people don't know the differance between the Catalog View's and DMV's.
The Following are SQL Databases and Files Catalog Views:
There is a full listing of Catalog Views here:
Dynamic Management Views here:
Full listing of system tables by topic is here:
Have fun! 😎