What type of Y-axis scale is most often used for graphs of circuit frequency response?

Circuit frequency response is typically graphed using a logarithmic scale on the Y-axis. This is usually expressed in decibels (dB), which inherently represent a logarithmic ratio of power or voltage. A logarithmic scale allows the graph to display an enormous dynamic range of amplitudes—from extremely weak signals to very strong ones—on a single, easy-to-read chart. If a linear scale were used instead, small but important signal variations at the lower end of the response would be visually compressed to a flat line, making them impossible to analyze compared to the peak values.