Online applications have been gaining wide acceptance among the general public. Companies like Amazon, Google, Yahoo! and NetFlicks have been doing extremely well over the last few years largely because of people becoming more comfortable and trusting of the Internet. The increasing acceptance of online products makes it increasingly important to address some of the scientific techniques involved in developing efficient 3D online systems. The topics discussed in this book broadly cover four categories: networking issues in online multimedia; joint texture-mesh simplification and view independent transmission; view dependent transmission and server-side rendering; content and background creation; and creating simple online games.