Tuners are devices used to adjust the frequency of a radio or musical instrument, ensuring they produce the correct pitch. In music, tuners help musicians, such as guitarists or pianists, achieve the right notes by comparing the sound of their instrument to a standard reference pitch. In the context of radio, tuners allow users to select specific frequencies to listen to different stations. They can be found in various devices, including car radios, stereo systems, and smartphones, enabling users to enjoy their favorite music or talk shows by tuning into the desired frequency.