Zope is a "web application system" comprised of a database, a publishing system, and an integrated security management system. Since the end of the nineties this platform has been open source and shared with a community that has grown to be one of the largest and most professional Open Source communities.
Zope is built with Python, our programming language of choice. The use of Python enables developing "light" or "heavy" applications with structure and easy coder-readability.
Zope has many add-ons (such as Plone) which in turn have many other addons. We live in our part of the Zope ecosystem with the skills to do most things one can do on the web.