A Phase Shift Oscillator is an electronic circuit that generates a continuous sine wave output. It typically uses an operational amplifier and a combination of resistors and capacitors to create a phase shift of 180 degrees. This phase shift, along with the inherent 180 degrees from the amplifier, results in a total phase shift of 360 degrees, allowing the circuit to sustain oscillations. These oscillators are commonly used in audio applications and signal processing. They are valued for their simplicity and ability to produce low-frequency signals. The design can be adjusted to change the frequency of oscillation, making them versatile for various applications.