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Code that runs when something happens, like a click, key press, or form submit.
Event handlers turn static UI into interactive software. They should be predictable, fast, and careful about state changes or network calls.
Plainly
Think of Event Handler as a named building block in a big LEGO app. Code that runs when something happens, like a click, key press, or form submit.
In practice
Use it when you are mapping how the app is structured or explaining a feature to a teammate or agent. In practice, define the owner, input, output, and failure mode before you rely on it.