I read the **requirejs** document from here [API](http://requirejs.org/docs/api.html#config-shim)
    
    requirejs.config({
        shim: {
            &#39;backbone&#39;: {
                //These script dependencies should be loaded before loading
                //backbone.js
                deps: [&#39;underscore&#39;, &#39;jquery&#39;],
                //Once loaded, use the global &#39;Backbone&#39; as the
                //module value.
                exports: &#39;Backbone&#39;
            },
            &#39;underscore&#39;: {
                exports: &#39;_&#39;
            },
            &#39;foo&#39;: {
                deps: [&#39;bar&#39;],
                exports: &#39;Foo&#39;,
                init: function (bar) {
                    //Using a function allows you to call noConflict for
                    //libraries that support it, and do other cleanup.
                    //However, plugins for those libraries may still want
                    //a global. &quot;this&quot; for the function will be the global
                    //object. The dependencies will be passed in as
                    //function arguments. If this function returns a value,
                    //then that value is used as the module export value
                    //instead of the object found via the &#39;exports&#39; string.
                    return this.Foo.noConflict();
                }
            }
        }
    });
    
    
but i am not getting **shim** part of it.
why should i use shim and how should i configure, can i get some more clarification 

please can any one explain with example why and when should we use shim.
thanks.


   

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Requirejs why and when to use shim config