Can you explain what is meant by a class containing only values, without additional methods or state?

This type of class is often called a "data class". It is used to store a set of values (fields) without additional logic, methods, or internal state, apart from the data itself. In Android and Kotlin, for example, a data class automatically generates methods like equals(), hashCode(), toString(), and copy(), which makes working with such objects easier.

Example in Kotlin:

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

Here, the User class contains only the values name and age without additional logic. This approach simplifies data transfer and storage, makes the code cleaner, and easier to test.