App routing is a technique for mapping a certain URL to a function that is supposed to do a specific activity. It is used to navigate to a certain page in the online application, such as the Flask Tutorial.
Routing is the process of mapping the URL directly to the code that builds the webpage. Routing is implemented in most web frameworks in Python.
All you have to do is use the /var> syntax (or the /converter:var> syntax where appropriate) to decorate your view functions. By default, when Flask extracts a variable from a URL for a dynamic route like the one you're trying to utilise, it'll be a Python unicode string.