Terahertz physics is an interdisciplinary research field focused on the study of electromagnetic radiation within the terahertz (THz) frequency range, typically spanning from approximately 0.1 to 10 THz, and its interaction with matter. This domain investigates the fundamental properties of THz waves, including their generation, detection, and manipulation, bridging the gap between microwave and infrared physics. It explores phenomena such as collective excitations in condensed matter, molecular spectroscopy, and electronic properties, leveraging the unique characteristics of THz radiation like its non-ionizing nature and distinct absorption/transmission properties to enable novel applications in areas such as non-destructive imaging, material characterization, and sensing.