What is change detection in Angular?
Model answer
Change detection is how Angular finds out what changed in your data and updates the DOM. After events such as clicks, timers or HTTP responses, Angular checks the component tree and refreshes bindings that changed.
By default, with Zone.js, any async event can trigger a check of the whole tree. Strategies and signals let you narrow that so Angular only checks what needs it.
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Angular Tutorial: Beginner to Advanced .
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