A voltage follower, also known as a buffer amplifier, is an electronic circuit that outputs the same voltage as its input but with a high input impedance and low output impedance. This means it can take a weak signal and drive a load without affecting the original signal's voltage level. Voltage followers are commonly used in analog electronics to prevent loading effects, where connecting a device might alter the signal. They are often implemented using operational amplifiers (op-amps), making them essential in various applications, including signal conditioning and interfacing different circuit stages.