Event is reaction of an action required by user.

Events provide a way for classes to notify listeners when certain actions have occurred. Since events are not required to be handled, they should typically be used to send information not critical to the central operation of the class.

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Event:Event is action identified the particular objects that is called Event.
examples:
If we take button click event when the user clicks on button it goes to fire the Event. 

Event is a small action that has to be handled.Every event has a structure add handler is

the one which is used to work actually.It works in event module.It can remove handler.

Event

An event is a user action defined by a portlet developer. User actions include clicking a link, a button, or other control.

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