An oscillator is a device or system that produces a repetitive, oscillating motion or signal. It can generate waves, such as sound or electromagnetic waves, by moving back and forth around a central point. Common examples include pendulums, tuning forks, and electronic circuits that create radio signals. In electronics, oscillators are crucial for generating clock signals in computers and other devices. They can be found in various applications, including radio transmitters, signal generators, and synthesizers. By controlling the frequency of oscillation, these devices can produce different tones or signals for communication and entertainment.