What is the result of compiling a Sealed Class in JVM?

When compiling a sealed class in JVM, an abstract class with the sealed modifier is created, and all its subclasses are compiled as separate classes, usually nested or in the same package. The compiler knows the complete set of subclasses of the sealed class, which allows for exhaustiveness checking when using when expressions without the need to write an else branch.

Thus, a sealed class in Kotlin on JVM is a limited set of subclasses known to the compiler, which improves type safety and ease of working with them.