What is CommonModule in Angular, and when do you need to import it?

Short answer: CommonModule provides common directives like *ngIf, *ngFor, ngClass, etc. You import it in feature modules or any module other than the root module. Don’t import BrowserModule in feature modules; instead, import CommonModule there.

Real-world example (ShopNest)

ShopNest admin can be built in Angular with modules/components, services for API calls, and reactive forms for product edit.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.