In electronics, a non-inverting amplifier is a type of amplifier that increases the amplitude of a signal without reversing its phase. This means that the output signal maintains the same polarity as the input signal. Non-inverting amplifiers are commonly used in various applications, such as audio equipment and signal processing, to enhance weak signals. The basic operation of a non-inverting amplifier involves applying the input signal to the non-inverting terminal of an operational amplifier, or op-amp. The gain of the amplifier can be adjusted using external resistors, allowing for precise control over the output signal's strength while preserving its original characteristics.