With recent advances in extended reality (XR) technologies that cover augmented, mixed, and virtual reality (AR, MR, VR), and the increasing availability of cutting-edge hardware, the distance between people and information is disappearing. New, smart technologies can ease the access of information in all aspects of living, leading people toward “the smart life.” This presentation aims to point out the applications, development trends, key technologies, current challenges, and prospects of extended technologies within the frame of both wearable and non-wearable devices. It will also present a review of the state-of-the-art for XR technologies, comprising displays, positioning and navigation, interaction, remote collaboration, and motion sickness technologies.