Content Fragments are a content abstraction in AEM that allows text-based content to be authored and managed independently of the channels it supports.
AEM Content Fragments are text-based editorial content that may include some structured data elements associated but considered pure content without design or layout information. Content Fragments are typically created as channel-agnostic content, that is intended to be used and re-used across channels, which in turn wrap the content in a context-specific experience.
This video series covers the authoring life-cycle of Content Fragments in AEM. Details about delivering Content Fragments can be found here.
Enabling and defining Content Fragment Models
Authoring Content Fragments
Downloading Content Fragments