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The event keyword is used in programming to indicate to the compiler or interpreter that a particular method or function is meant to handle an event that is triggered by the user or the system. Without the event keyword, the application may still function, but it may not be able to handle events in a proper and efficient manner. The event keyword helps developers to write cleaner and more maintainable code that is easier to read and understand. It also helps in ensuring that the code is scalable, as it provides a clear structure for adding and managing new events.