What is change detection in Angular?

Change detection in Angular is a mechanism that tracks data changes in the application and automatically updates the user interface.

How it works:

1. Angular checks the values of component properties and binds them to the template.
2. If the data has changed, Angular re-renders only the parts of the template where it is used.
3. The mechanism responds to events, asynchronous operations, and changes through zone.js.

Conclusion: change detection lets the interface always stay synchronized with the state of the data without manually updating the DOM.