What is & for what purpose a Bode diagram ?

Based on Wikipedia, In electrical engineering and control theory, a Bode plot /ˈboʊdi/ is a graph of the frequency response of a system. It is usually a combination of a Bode magnitude plot, expressing the magnitude of the frequency response, and a Bode phase plot, expressing the phase shift. Both quantities are plotted against a horizontal axis proportional to the logarithm of frequency.

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A Bode diagram is a way of representing the frequency behavior of a system. It allows a simplified graphical resolution, in particular for the study of the transfer function of a controlled system.