A non-inverting amplifier is a type of electronic amplifier that increases the amplitude of a signal without reversing its phase. It uses an operational amplifier (op-amp) configured in a way that the input signal is applied to the non-inverting terminal. This configuration allows the output signal to be in phase with the input, making it useful in various applications where signal integrity is important. The gain of a non-inverting amplifier is determined by the ratio of two resistors connected in the feedback loop. This gain can be adjusted by changing the resistor values, allowing for precise control over the amplification level. Non-inverting amplifiers are commonly used in audio equipment, sensor signal conditioning, and other electronic circuits.