The document discusses building native mobile apps using Javascript with Appcelerator versus PhoneGap. It notes the main advantages of Appcelerator are the speed of development since no Objective-C or Java knowledge is required, yet native apps can be created. It allows for cross-platform development across iOS and Android. Appcelerator is compared to PhoneGap, with Appcelerator using native development so performance is better, while PhoneGap uses a HTML container with more platforms supported but lower performance. The document demonstrates extending apps with native modules and the Alloy framework.