Collections in Plone are the most powerful tool content editors and site managers have to construct navigation and site sections.
This is a brand new implementation of collections for Plone, using ajax/javascript to make a simpler, easier and streamlined user experience for using collections. Having a more lightweight backend that does not depend on many nested criteria types.
It's designed with simplicity and usability as a main focus, so content editors and site managers can create complex search queries with ease.