Answer
Change detection updates the UI when data changes. Angular checks component trees after async events using Zone.js.
Two strategies exist: Default (checks all components) and OnPush (checks only when needed).
Quick Answer
Change Detection (CD) checks if component model has changed and updates the DOM. Zone.js detects async operations and triggers CD. Angular traverses the component tree top-down checking each component. Default strategy: check all components on every CD cycle. OnPush: check only when inputs change or local event fires. Use OnPush for performance optimization in large component trees.
S
SugharaIQ Editorial Team
Verified Answer
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Source: SugharaIQ