When building a new module, you always get to the point where you want to use the routes you have been created, or other URLs, so if you find yourself always looking for how to print out a URL, this article is for you.

The difficulty is that finding or printing out a URL is very contextual and there is more than one way to get or use this information in Drupal. 

You might have a node object that you need to convert into a fully qualified path, or you want to print out the path of a route, each of which has different approaches.