Designate individual lists and document libraries in this site collection as catalog sources for Cross-Site Collection Publishing. ...

Designate individual lists and document libraries in this site collection as catalog sources for Cross-Site Collection Publishing. 

Enabling a list or document library as catalog will allow authors in other site collections who have access to the same search database to reference the contents of the list or document library when creating publishing pages on their sites.

Your content approval process should take into account that any changes will be published to other site collections that may have become dependent on this content.