Answer

Use Sealed Classes when you have a restricted class hierarchy where a value can have one of a limited set of types.

Use Cases

1. State Management: Representing UI states (Loading, Success, Error).
2. Result Wrapper: Handling API responses (Success, Failure).
3. Event Handling: Defining a fixed set of user actions.

Benefits

• Exhaustive `when`: The compiler forces you to handle all subclasses in a `when` expression, ensuring type safety.
• Data Carrying: Unlike Enums, sealed class instances can hold different data.

```kotlin sealed class UiState { object Loading : UiState() data class Success(val data: String) : UiState() data class Error(val message: String) : UiState() } ```