UI Toolkit provides events that communicate user actions or notifications to visual elements. The UI(User Interface) Allows a user to interact with your application. Unity currently supports three UI systems. More info
See in Glossary Toolkit event systemA way of sending events to objects in the application based on input, be it keyboard, mouse, touch, or custom input. The Event System consists of a few components that work together to send events. More info
See in Glossary shares the same terminology and event naming as HTML events. The following concepts are the core of the event system:
Event types fit into a hierarchy based on the EventBase class. Each event type implements an interface that defines the common characteristics for all events of the same family.
The event reference page provides more information on the behavior and characteristics of each event family.