What is the purpose of the internal keyword in defining scope in programming?

The keyword internal in programming languages (for example, in Kotlin) restricts the visibility scope of an element (class, function, property) within a single module. This means that such an element is accessible from anywhere within the module but not accessible from other modules.

This is convenient for encapsulating logic within a module, allowing to hide implementation details from external code while providing free access within the module.

Example in Kotlin:

internal class Helper {
    fun doSomething() { /*...*/ }
}

The Helper class will be visible and accessible only within the current module.