Standalone components in Angular are designed to simplify the module system by allowing components to be declared without needing to be part of an Angular module (NgModule). Here are some reasons why standalone components are useful:

1. Simplified Dependency Management: Standalone components can directly import other components, directives, and pipes without needing to declare them in an NgModule.

2. Improved Tree Shaking: By reducing the reliance on NgModule, standalone components can help improve tree shaking, leading to smaller bundle sizes.

3. Easier Testing: Standalone components can be tested in isolation more easily since they don't depend on an NgModule.

4. Better Code Organization: They promote better code organization by allowing developers to group related components, directives, and pipes together without needing to create separate modules.

5. Incremental Adoption: They allow for incremental adoption of the new Angular features without needing to refactor existing modules.

 The standalone: true property indicates that AppComponent is a standalone component. This means it can be used independently without being declared in an NgModule.