The Hartley Oscillator is a type of electronic oscillator that generates sine waves. It uses an inductor-capacitor (LC) circuit to produce oscillations, making it useful in radio frequency applications. The circuit typically includes a single inductor and two capacitors, which help determine the frequency of the output signal. This oscillator is named after its inventor, Arthur Hartley, who developed it in the early 20th century. The Hartley Oscillator is known for its simplicity and stability, making it a popular choice in various electronic devices, including transmitters and signal generators.