# Common Concepts

- [Overview](/v2.0/common-concepts/overview.md)
- [The Subscription](/v2.0/common-concepts/the-subscription.md)
- [The Notification](/v2.0/common-concepts/the-notification.md)
- [The Status Report](/v2.0/common-concepts/the-status-report.md)
- [VAPID](/v2.0/common-concepts/vapid.md): Voluntary Application Server Identification