The APNs for Applications page displays the APNs certificates that correspond to AirWatch apps on the app store. These are required for sending push notifications to apps, and in most cases these are settings you should not alter unless instructed to do so by AirWatch.

For more information, please see the Generating and Renewing an APNs Certificate for AirWatch KB article:  https://support.air-watch.com/articles/115001662728.