Definitions of the Directory User Capabilities

I'm struggling to understand what each of the capabilities do in the Directory plugin and wondered if anyone could help me understand what each of these do.

View listings.
View private listings.
Add listings.
Edit listings.
Edit published listings.
Edit private listings.
Delete listings
Delete published listings.
Delete private listings.
Edit others' listings.
Delete others' listings.
Upload files.

My main headache is trying to understand what private listings are?