SQL server

Catalogs vs DMVs. What is the difference?

Is it a catalog or a DMV. I have seen some posts that have used it interchangeably.  So what is the true difference? Apparently there is: catalogs get data from [hidden] tables and DMVs get their data from views and internal functions. So catalogs read from disk and DMVs read from memory. This also goes to say that DMVs do not persist information across instance restarts.

DMVs contain changing information like IOs done to disk, session information,  etc… and catalogs contain less changing information about the database like name and location of the data files, etc…

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