Have you used data classes in your projects?

Yes, data classes are actively used in Android projects, especially when working with Kotlin. A data class is a convenient way to create classes that mainly contain data, with automatically generated methods equals(), hashCode(), toString(), and also a copy() function.

Example of a data class in Kotlin:

data class User(val id: Int, val name: String, val email: String)

Such a class is useful for passing data between layers of an application, serialization, working with APIs, etc.