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 buffer amplifiers useful in applications where signal strength needs to be preserved without distortion. Buffer amplifiers are commonly used in various electronic devices, including audio equipment, sensor interfaces, and data acquisition systems. They can also be found in operational amplifier configurations, where they help to drive heavy loads or connect incompatible circuits without signal degradation.