Explain Angular Change Detection Strategies (Default vs OnPush).

Quick Answer Default CD: checks every component on every cycle - simple but potentially slow for large trees. OnPush CD: component is only checked when inputs change (by reference), an event fires from within, async pipe emits, or markForCheck()/detectChanges() is called. OnPush with immutable data patterns dramatically reduces unnecessary DOM checks. Use Angular DevTools to visualize CD cycles.

Answer

Default Strategy: Angular runs change detection for the entire component tree whenever any async event occurs. Simple but expensive for large apps.

OnPush Strategy: Angular checks the component only when its input reference changes, an observable emits, or an event originates from the component. This dramatically improves performance.

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Explain Angular Change Detection Strategies (Default vs OnPush).

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