anatomy of AMD module loading

gistfile1.js

require([
        "esri/map", "esri/InfoTemplate", "esri/layers/FeatureLayer",
        "dojo/parser", "dojo/domReady!"        
      ], function(              //Beginning of anonymous callback which fires when modules have been loaded.
        Map, InfoTemplate, FeatureLayer, 
        parser                  //Variable names to refer to loaded modules
      ) {
        parser.parse();         //first line of actual callback code
        map = new Map("mapDiv", { 
          basemap: "national-geographic",
          center: [-96.541, 38.34],
          zoom: 6
        });
        ...
        
        })      //close out the anonymous callback function and require method's parenthesis