This sets up an event listener for any GET request that comes into the server with the path of `/`. Give it a callback function which takes a request variable and a respond variable. Each of these have different methods/properties which we'll learn about
This can get difficult to maintain with a lot of variables, so we can group urls together
## MVC
One of the main goals of express is to cleanly separate data from the view layer. To do this, it follows the Model View Controller pattern, which creates a middleman (Controller) which passes data (Models) off to the presentation/html (View) layer
In addition, putting all your routes inside server.js can become difficult to maintain with a lot of variables. We can group similar urls together into separate "controller" files.
```javascript
var runsController = require('./controllers/runs.js'); //require our own runsController
@ -99,7 +103,7 @@ controller.get('/', function(req, res){ //route for finding all routes by a the
