Titanium is an open source framework for building cross-platform native mobile apps using JavaScript and optionally HTML/CSS. It allows developers to write once and deploy to multiple platforms like iOS, Android, and BlackBerry without maintaining separate codebases. Titanium apps are compiled to true native apps for each platform, providing access to full native capabilities and high performance. The demo will show how to create a simple "Hello World" Titanium app and deploy it to the iOS simulator.