What are sealed classes in Kotlin?

Answer 1

Kotlin: Sealed Class
https://www.baeldung.com/kotlin-sealed-classes
https://www.journaldev.com/18719/kotlin-sealed-class
https://www.javatpoint.com/kotlin-sealed-class

Answer 2

Sealed classes are used when a value can have only one of the types from a limited set!!
For more info visit the link:
https://kotlinlang.org/docs/reference/sealed-classes.html
https://stackoverflow.com/questions/50772328/what-are-sealed-classes-in-kotlin