What is the purpose of the companion object in Kotlin?

In Kotlin, the companion object is used to declare a companion object inside a class. This allows creating static members (methods and properties) that belong to the class rather than a specific instance.

A companion object behaves like a singleton associated with the class, and its members can be accessed through the class name without creating an object.

Example:

class MyClass {
    companion object {
        fun create(): MyClass = MyClass()
        const val CONSTANT = 42
    }
}

fun main() {
    val instance = MyClass.create()  // calling the companion method
    println(MyClass.CONSTANT)        // accessing the companion constant
}

Thus, companion object replaces static members, which are not present in Kotlin, and allows conveniently grouping class-related functions and data.