Why common collector configuration is uses as a buffer?

The common collector configuration, also known as an emitter follower, is used as a buffer because it provides high input impedance and low output impedance. This allows it to effectively isolate different circuit stages, preventing the loading of the previous stage while driving the next stage with sufficient current. Additionally, it maintains a voltage gain close to unity, ensuring that the output voltage closely follows the input voltage without significant loss. This makes it ideal for signal buffering applications.