Propagation is the study of how waves, such as light, sound, or radio waves, travel through different mediums or environments. This research area focuses on understanding the factors that influence the transmission and reception of waves, including reflection, refraction, diffraction, and interference. Propagation research is important in various fields, such as telecommunications, wireless networking, acoustics, and optics, as it helps in designing and optimizing communication systems and devices for efficient wave transmission. Additionally, propagation studies also play a crucial role in predicting and mitigating signal degradation or interference in practical applications.