The following features are enabled by Organizations:

Flexible and centralized product data and catalog management: Ability to manage EP PXM data at the organization level for merchandisers
Centralized commerce operations: Multi-store sellers can now manage all their stores from a centralized system, eliminating the need to log into separate admin systems for each site
“Write once use everywhere” integrations: Includes support for instant-on integrations, via Integrations Hub, that can be shared and managed across all stores in the organization
Single point configurations: Allows businesses to define and manage settings at the organization level that apply across all stores
Access management: Automatic super admin permissions for org admins to all the stores in the organization