The inverse of exponential functions is termed as logarithmic functions. The logarithmic function, y = logax corresponds to the exponential equation, x = ay. y = logax. However, this relation holds only under a specific condition. Only if – (1) x = ay, (2) a > 0, and (3) a≠1, will the relation be applicable. Having a clear idea about logarithmic functions is essential for solving even the basic log questions.