The rhythm section is a group of instruments in a musical ensemble that provides the foundational beat and harmony. Typically, it includes instruments like the bass guitar, drums, and sometimes piano or guitar. These instruments work together to create a steady pulse, allowing other musicians to build melodies and harmonies on top. In many genres, such as jazz, rock, and pop, the rhythm section plays a crucial role in establishing the song's groove and feel. By maintaining a consistent tempo and supporting the overall structure, the rhythm section helps to unify the performance and keep the music engaging for listeners.