A buffer amplifier is an electronic circuit that isolates different stages of a system while maintaining signal integrity. It typically has a high input impedance and a low output impedance, allowing it to prevent loading effects on the previous stage. This makes it useful for connecting components that may not be compatible in terms of impedance. Buffer amplifiers are commonly used in various applications, including audio systems, sensor interfacing, and data acquisition. They can be implemented using operational amplifiers, which are versatile components in electronics. By providing a stable output, buffer amplifiers help ensure accurate signal transmission and processing.