core + meta (Meta Extension): terms used within schema.org for schema definitions.

about

Canonical URL: http://schema.org/about

Thing > Property > about

The subject matter of the content.

Usage: Between 10,000 and 50,000 domains
Values expected to be one of these types
Thing
Used on these types
CommunicateAction
CreativeWork
Event
Sub-properties
mainEntity


Examples

Schema Version 3.3