This document provides an overview of auditory evoked responses and their classification. It discusses the historical development of different auditory evoked potentials and how they can be classified based on whether they are evoked or non-evoked, the time period following stimulation, the location of recording electrodes, and the structures in the auditory system that generate them. Key auditory evoked responses discussed include the cochlear microphonic, summating potential, auditory brainstem response, middle latency response, and P300.