Type III radio bursts arise from suprathermal electrons accelerated during solar flares. These electron beams, responsible for generating Type III bursts, propagate outwards from the Sun along open magnetic-field lines in the interplanetary (IP) medium, with typical speeds ranging between 0.3c to 0.05c. As they move, these beams induce the bump-on-tail instability, locally exciting intense Langmuir waves at the electron plasma frequency. The conversion of these waves into electromagnetic emissions involves a cascade of nonlinear processes, the specifics of which remain subjects of active debate.