The "ArcGIS JavaScript API", sits directly on top of Dojo framework, providing developers with access to Dojo user interface widgets and all the other benefits of Dojo core. Whit this ArcGIS you can build a html5/javascript mapping applications and the api allows you to easily embed maps in your web pages. An ArcGIS application utilizes a layer-based (TiledLayer, DynamicLayer, FeatureLayer, etc...) geographic information model for characterizing and describing our world. An ArcGIS application asks what it need, through a http/rest service (the service will return images or json data - for example) hosted on the ArcGIS server. In this simple html5/javascript demo project (http://sdrv.ms/UGlW0p) you can find five examples that show the basic functionality of the mapping framework "ArcGIS API for JavaScript" (will be shown the basic functionality of the ArcGIS classes layer). You can download the demo code at this link: http://sdrv.ms/UGlW0p - There is also a video on YouTube: http://youtu.be/2IV29O0dW2M