CodeIgniter URL

We have two types of URL: 1) Query URL  2) segment based  URL

Example: 1) Query Based  URL =>  https://example.com/view.php?product=20&cat=books

                      You can see that we can use ? and & = these are the query url.  

 Example: 2) Segment Based URL => https:// example.com/view/product/20/cat/books

                        You can see that we can use /  these are the segment base url.

Understand the URL pattern 

 URL => https:// example.com/view/product/20/cat/books

URI =>  view/product/20/cat/books

URL =  Base URL + URI

URL =  https:// example.com  +  view/product/20/cat/books

                                                 Understand the CodeIgniter Url Segment 

URL => https:// example.com/class/method/id

Example:  class testing 

{

                public function welcome()

                {

                  return "Welcome";

                }

   }  

URL  =>  https://example.com/testing/welcome

Note:-

1.  The first segment represents the controller class that should be invoked.
2.  The second segment represents the class method that should be called.
3. The third ,and any additional segments, represent the ID and any variables that will be             passed to the caontroller.