This module is part of the Apache Sling project.
It implements OSGi DS 1.4 component property type annotations for Sling adapters.
These annotations are documented on the Apache Sling Adapters documentation page, and the code of the integration tests (under src/it/annotations-it/) can help understand the details.
We also have an older Sling Adapter Annotations (JSON) module, which implements Annotations used to generate a Sling Adapter metadata JSON file.