Bulk shares send records out of your instance as a pre-filtered range of data all at once. The bulk share job in ServiceNow can share multiple tables through ServiceNow's table hierarchy, run through advanced filters and scripts, share out related/auxiliary records, and more.
Watch the instructional video below for help getting started with DataSync Express bulk shares.
Alternatively, or in addition, you can see instructions in this article: Create a DataSync Express bulk share.