Rich media stands for any dynamic combination of video, audio, images, graphics, text; and featuring interactivity, animation, and dynamic behavior over time according to the user's requests. Using rich media allows for better user interfaces, replacing unwieldy catalogs by fluid services and eye-pleasing presentations. The term rich media is different from "multimedia," the latter being sometimes identified with "audiovisual." The lightweight application scene representation (LASeR) is the rich media representation standard for mobile devices based on reusing simple MPEG-4 Systems tools and the MPEG-4 decoder model. LASeR addresses rich media services on a wide range of devices and delivery situations. © 2008 IEEE.