angularjs - Some misunderstanding of this keyword in Angular controller -


i learning angularjs.and have missunderstandig on example:

(function () { "use strict"; angular.module("productmanagement").controller("productlistctrl", productlistctrl);  function productlistctrl() {     var vm = this;      vm.products = [     {         "productid": 1,         "productname": "leaf rake",         "productcode": "gdn-0011",         "releasedate": "march 19, 2009",         "description": "leaf rake 48-inch wooden handle.",         "price": 19.95     },     {         "productid": 2,         "productname": "garden cart",         "productcode": "gdn-0023",         "releasedate": "march 18, 2010",         "description": "15 gallon capacity rolling garden cart",         "price": 32.99     },      {          "productid": 5,          "productname": "hammer",          "productcode": "tbx-0048",          "releasedate": "may 21, 2013",          "description": "curved claw steel hammer",          "price": 8.99      },      {          "productid": 8,          "productname": "saw",          "productcode": "tbx-0022",          "releasedate": "may 15, 2009",          "description": "15-inch steel blade hand saw",          "price": 11.55      },      {          "productid": 10,          "productname": "video game controller",          "productcode": "gmg-0042",          "releasedate": "october 15, 2002",          "description": "standard two-button video game controller",          "price": 35.95      }     ];   }  }());

what meaning of row:

  **var vm = this;**

any explanation please meaning of this keyword in current context?


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