@TRACK(to make property reactive) AND @API(to expose property to different component or parent class )

The `@track` decorator in Lightning Web Components (LWC) is used to make a property reactive, meaning that changes to the property will cause the component to re-render. However, `@track` is used for internal state management within the component itself and is not intended for exposing properties to parent or other components.

Here’s a comparison:

- `@api`: Used to expose properties and methods to parent components. It makes the property or method public.
- `@track`: Used to make properties reactive within the component. It is used for internal state management.

Example using `@track`:

```javascript
import { LightningElement, track } from 'lwc';

export default class MyComponent extends LightningElement {
    @track internalState = {}; // This property is reactive within the component

    handleChange(event) {
        this.internalState.value = event.target.value;
    }
}
```

In this example, `internalState` is a reactive property that will cause the component to re-render when its value changes, but it is not exposed to parent components.

Use `@api` when you need to expose properties or methods to parent components, and use `@track` for managing internal state that should trigger re-renders when changed.










import { LightningElement, track } from 'lwc';

export default class MyComponent extends LightningElement {
    @track internalState = {}; // This property is reactive within the component

    handleChange(event) {
        this.internalState.value = event.target.value;
    }
}