An operational amplifier, or op-amp, is a versatile electronic component used to amplify voltage signals. It typically has two input terminals, inverting and non-inverting, and one output terminal. Op-amps are widely used in various applications, including signal processing, filtering, and mathematical operations like addition and subtraction. Op-amps are characterized by their high input impedance and low output impedance, making them ideal for interfacing with other circuits. They can be configured in different ways, such as inverting, non-inverting, or differential amplifiers, allowing for a range of functionalities in electronic designs.