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core + bib (Bibliographic Extension): terms relating to books and bibliography.

about

Defined in the pending.schema.org extension.
Canonical URL: http://schema.org/about

Thing > Property > about

The subject matter of the content.

Usage: Between 10,000 and 50,000 domains

Inverse-property: subjectOf.

Values expected to be one of these types
Thing
Used on these types
CommunicateAction
CreativeWork
Event
Sub-properties
mainEntity

Source

https://github.com/schemaorg/schemaorg/issues/1670



Examples

Example 1
A JSON example for an Article about a particular event.
N/A
N/A
<script type="application/ld+json">
{
  "@context": "http://schema.org/",
  "@type": "Article",
  "name": "Apple announces iPhone SE",
  "description": "New iPhone announced at 11:30 in California.",
  "about": {
    "@type": "Event",
    "name": "Apple's March 21 Announcements"
  },
  "contentReferenceTime": "2016-03-21T11:30:00-07:00"
}
</script>

Schema Version 3.3