What types of visibility modifiers exist in Dart?

In Dart, there is one main way to modify the visibility level — using the underscore prefix before the name of a variable, method, or class. If the name starts with an underscore (_), then this element becomes private to the library (file) in which it is declared.

Example:

class MyClass {
  int _privateValue = 42; // private field

  void _privateMethod() { // private method
    print('This is a private method');
  }

  void publicMethod() {
    print('This is a public method');
  }
}

In Dart, there are no keywords like public, private, or protected as in other languages. Visibility is limited to the library, not the class or inheritance.