This lecture discusses the reflection coefficient of loads in transmission lines, focusing on resistive and reactive terminations. It explains how boundary conditions are imposed by terminations, generating reflected voltages and currents. The lecture also covers the behavior of transmission lines with resistive loads, the generation of square waves, and the conditions for wave reflection. Various scenarios of disturbances and reflections on discontinuities are analyzed, emphasizing the importance of impedance matching and the absence of reflections in certain cases.