Plone Database

Plone is technology neutral. Plone can interoperate with most relational database systems, open source and commercial.

However, by default, Plone stores its contents in Zope's built in transactional object database, the ZODB.

ZODB, the Zope Object Database, is a persistent object database system for Python. It provides facilities to write objects to disk automatically, read them in again when they're required by a running program, and cache them. On the file system, this database is contained in the file "Data.fs", normally located in the "var" directory.