pass variable from custom module file to twig template in d8 How to pass variable from controller to twig template in Drupal-8? 
I have tried to pass variable on module theme folder, but I want to use this variable on global theme?
First create a function that returns the variable, something like this:

function my_function() {
return $var_name;
}


Then you must create a preprocess function, for the template, like this:

function MY_MODULE_preprocess_TEMPLATE(&amp;$variables) {
  $V_NAME = my_function();
  $variables['v-name'] = $V_NAME;
}


Remember to clear the cache.