Operator overloading is an advanced concept of the programming language that defines custom behaviors for operators such as +, *, or, ==. Overload operators in Kotlin provide specific functions and all properties that define their behavior. For example, for a custom class to concatenate or merge objects in a way you can define the "+" operator. This makes sense for your specific use case. By everything these operator overloading individuals can become more tutor and expressive to write a code. It is especially helpful when working with custom data types or domains specific operations.