This chapter describes research pertaining to mobile interfaces, with a focus on input modalities and formal features such as screen size and interaction techniques. It then examines application domains of mobile human-computer interaction (HCI). Next, the chapter discusses the wide landscape of extant HCI research pertaining to mobile media. With larger screen sizes and greater fidelity in rendering graphics, images, and video content, mobile media have emerged as a viable platform for 3D and other immersive-reality experiences. Information-seeking is perhaps the most important gratification sought and obtained from mobile media. Mobile commerce is an application domain that continues to expand as more and more consumers as well as vendors conduct commercial transactions via mobile interfaces. An important aspect of mobiles for development (M4D) research is a focus on understanding the various uses of mobile media in underdeveloped regions, as they shed light on the affordances of importance and provide insights for designing mobile interventions.
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