In the common-collector configuration, also known as the emitter-follower configuration, the collector terminal is common to both the input and the output sections. The configuration is similar to the common-emitter configuration with the output taken from the emitter terminal rather than the collector terminal. CC configuration offers high input impedance and low output impedance and hence it is used for impedance matching applications, that is, for driving low-impedance load from a high-impedance source. The voltage gain offered by CC configuration is less than unity and the value of the current gain is high. The output characteristics of the CC configuration relate the emitter current (IE) to the emitter-collector voltage (VEC) for different values of base current (IB). The characteristics are similar to that for the CE configuration.