Resonators are devices or systems that amplify specific frequencies of sound or electromagnetic waves. They work by vibrating at particular frequencies, which enhances the sound or signal produced. Common examples include musical instruments like guitars and violins, where the body of the instrument acts as a resonator to enrich the sound. In addition to musical applications, resonators are also used in technology, such as in radio transmitters and lasers. These devices can be designed to resonate at specific frequencies, allowing them to filter or enhance signals, making them essential in communication and various scientific applications.