Signal propagation is the academic field or concept investigating the transmission of signals, defined as disturbances or changes encoding information or energy, through a physical medium or space. It encompasses the study of the mechanisms, characteristics, and phenomena governing this transmission, such as speed, amplitude change (attenuation or amplification), waveform distortion (dispersion), and interaction with the transmission path (reflection, refraction, scattering). Understanding signal propagation is critical across numerous scientific and engineering disciplines for designing communication systems, interpreting physical measurements, and modeling dynamic processes.