Remember that the transfer characteristic curve represents the relationship between the input parameter, which is gate source voltage (VGS), and output parameter, which is the drain current (ID).
The transfer characteristics of a Junction Field-Effect Transistor (JFET) are typically represented by a graph that plots the drain current (\( I_D \)) against the gate-source voltage (\( V_{GS} \)). This graph is used to show the behavior of the JFET and how the drain current is affected by the gate-source voltage, which in turn determines the operating region of the JFET.