Explain the path system of drupal ?

When you visit a URL within your Drupal site, the part of the URL after your base site address is known as the path.

When you visit a path in your Drupal site, Drupal figures out what information should be sent to your browser by checking its list of menu items and routes. Generally, Drupal allows each module to define paths that the module will be responsible for, and when you choose to visit a particular path Drupal asks the module what should be displayed on the page.