aura:event

An event is represented by the aura:event tag, which has the following attributes.
Attribute Type Description
access String Indicates whether the event can be extended or used outside of its own namespace. Possible values are public (default), and global.
description String A description of the event.
extends Component The event to be extended. For example, extends="namespace:myEvent".
type String Required. Possible values are COMPONENT or APPLICATION.