Ace the Angular Interview 2025 – Code Your Way to Success!

Change detection in Angular refers to the mechanism that determines when the view needs to be updated based on changes in the underlying data or model. Whenever data bound to the view changes, Angular checks for these modifications and updates the corresponding UI elements. This ensures that what the user sees is in sync with the data in the application.

For instance, when a property in a component changes as a result of user interaction or an asynchronous operation, Angular triggers change detection to reflect those changes in the template automatically. This process helps maintain the consistency and integrity of the user interface with minimal developer effort, providing a reactive programming model.

Understanding change detection is crucial because it directly influences the performance and efficiency of Angular applications. Optimizing change detection strategies can lead to improved application responsiveness, making insights into this mechanism particularly valuable for developers.