Controller in Angular

• It is responsible to control the relation between models and views.
• It responds to user input and performs interactions on the data model objects.
• The controller receives input, validates it, and then performs business operations that modify the state of the data model.
• It is a JavaScript function.
• A controller is associated with a HTML element with the ng-controller directive.

In JS

Declaration Type #1           
 var myController = function(){ 
                                      //Business logic  
               } 
  myApp.controller(“myController”, myController);       

Declaration Type #2          
    myApp.controller(“myController”, function(){

                    //Business logic

                 });

In Html       
  <div ng-controller=‘myController’> </div>