Hi rakesh,
The events registry lists the events the system recognizes. Use registered events to automate other activities, such as script actions or notifications.
After you create a new event and a business rule that uses the event, you must register it.
Try playing it with the exercise below, it will help you to understand how and when to use it:
https://developer.servicenow.com/app.do#!/document/content/app_store_learnv2_automatingapps_jakarta_...
For any other information, refer to the official documentation below:
Event registry
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Thank you
Cheers
Alberto
