Wikipedia:

event

(UML)

In the Unified Modeling Language, an event is a notable occurrence at a particular point in time. Events can, but do not necessarily, cause state transitions from one state to another in state machines represented by state machine diagrams. A transition between states occurs only when any guard condition for that transition are satisfied.

An event is an action or occurrence detected by a program. Events can be user actions, such as clicking a mouse button or pressing a key, or system occurrences, such as running out of memory. Most modern applications, particularly those that run in Macintosh and Windows environments, are said to be event-driven, because they are designed to respond to events.

A database event can be anything relative to the rows in a table or values in fields.

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