Packs are collections of content that have been added to the content library.
Packs are special files that live in a workspace, and can be shared.
A pack will contain some or all of the following:
Geometries
Usages
Flows
Blocks
Analytics
Data Layers
Report Builder templates
Graphics, annotations, and 3D models
Additionally, packs have some metadata to help people find them in the content library:
A name
A description
Keywords
A thumbnail