Can you list the types of classes that exist in Kotlin?

In Kotlin, the following class types exist:

• Regular classes — standard classes that can be inherited (unless declared with the final modifier).
• Data classes — classes intended for storing data, automatically generate equals(), hashCode(), toString(), as well as copy() functions and destructuring components.
• Sealed classes — restrict the inheritance hierarchy, allowing subclasses only within the same file.
• Abstract classes — classes that cannot be instantiated directly and may contain abstract methods.
• Inner classes — nested classes that have a reference to the outer class.
• Nested classes — nested classes without a reference to the outer class (by default, nested classes in Kotlin are nested).
• Companion objects — objects within a class that allow creating static members.

Example of a data class:

data class User(val name: String, val age: Int)