# What is the difference between event_id and event_uid?

The `event_id` is only used for events that your application creates, what we call *managed* events. This is an ID that your application specifies. We use it as a key for an application's *managed* events.

The `event_uid` is a Cronofy wide unique key for the event. It is only used when interacting with *external* events.

For example when your app as obtained explicit permission from the end-user to [edit external events](/developers/api/authorization/extended-permissions/index.md) you use the `event_uid` to [edit external events](/developers/api/events/edit-external-events/index.md).


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