A Bode plot is a graphical representation used in control theory and signal processing to analyze the frequency response of a system. It consists of two plots: one showing the magnitude (in decibels) versus frequency (on a logarithmic scale) and the other showing the phase shift (in degrees) versus frequency. This helps engineers understand how a system behaves at different frequencies. Bode plots are particularly useful for designing and tuning control systems. They allow engineers to assess stability and performance by visualizing how the system responds to various input frequencies. By analyzing these plots, adjustments can be made to improve system behavior.