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The Terahertz (THz) frequency range is generally defined as the region of the electromagnetic spectrum in the range of 0.1 to 10 THz. Although interest in this region dates back to the 1920s, incredible progress has been made only within the past three decades. Recent advances in the THz research field have unlocked key applications and unprecedented functionalities; THz systems and applications are nowadays being employed in various commercial applications, such as biomedical imaging, sensing, spectroscopy, and beyond 5G wireless communication. However, in order for THz technology to be scalable and be able to compete with other technologies, numerous challenges must still be addressed. This Collection aims to showcase the current progress and latest solutions in emergent applications of THz technology, and will consider research in engineering, electronics, photonics, and nanotechnology.