Facets extend base IDE features with additional frameworks support by providing additional libraries, dependencies, technologies, and UI elements for configuring framework-specific settings.

Facet Basics represents configuration specific for a particular framework or technology, associated with a module. SDK Facet is available to use in the Project Settings > Facets section. It allows us to specify any configuration specified by the FacetConfiguration implementation - path to the SDK in this case.

Extension Points

Name	Implementation	Extension Point Class
`com.intellij.facetType`	DemoFacetType	FacetType

Reference: Plugin Extension Points in IntelliJ SDK Docs