Explain the concept of data class in Kotlin and how it differs from regular classes.

A data class in Kotlin is a special class designed for storing data. When declaring a class with the data keyword, the compiler automatically generates useful methods for it: equals(), hashCode(), toString(), as well as copy() functions and components for destructuring.

Differences from regular classes:

• Automatic generation of comparison and copying methods.
• Simplified syntax for creating classes that mainly contain data.

Example of a data class:

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

fun main() {
    val user1 = User("Ivan", 30)
    val user2 = user1.copy(age = 31)
    println(user1) // User(name=Ivan, age=30)
    println(user2) // User(name=Ivan, age=31)
}

Thus, a data class is convenient for data models where simplicity and correct object comparison are important.