The Terahertz band, large frequency band between the domain of the micro-electronics and the domain of the infrared light has been known for many decades as a gap in the electromagnetic spectrum: difficult to generate, even more difficult to detect. Confined for a long time to astronomers, the area open up to spectroscopist, material science researchers and even reached the domain of homeland security. A great number of scientist have claimed that in the years 2000's Terahertz will emerge as the next big thing. It is now obvious that THz is not yet the mainstream technology that many hoped. Nevertheless, interesting fundamental research is pursued thanks to large improvements in the instruments and the materials such as graphene for example; a dynamic pool of start-up emerged proposing new THz devices for selected applications and more companies investigates the possibilities of the Terahertz equipment in their chain of production for online monitoring. The present talk will give you an overview of the current research in the THz domain, including the one done at TUDelft and its current and possible future applications including those for the communication industry.