Sometimes I encounter a public static function create() in plugin classes, for the example in the code show in Tutorial on Using Drupal 8 Plugin Derivatives Effectively.

public static function create(ContainerInterface $container, $base_plugin_id) {
  return new static(
    $container->get('entity.manager')->getStorage('node')
  );
}

Could you clarify me what the purpose of that function is, for example what it should do and where it's used?