1. How do you define a class in Kotlin?

• Use the class keyword followed by a name. You can then optionally add properties and methods.

2. How do you define an interface in Kotlin?

• Use the interface keyword followed by a name. You can then optionally add properties and functions.

3. What are data classes?

• Special classes that generate the equals(), hashCode(), and toString() implementations, and are ideal for immutable data classes

4. What are sealed classes?

• A special type of class useful for creating restricted class hierarchies. They are similar to enums, but allow each type in the hierarchy to have unique properties and methods.

5. How is a sealed class different from an enum?

• Sealed classes can include multiple different classes within the hierarchy and can include different data and methods.

6. What is an object expression?

• Kotlin&apos...