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A tuner refers to an electronic device used for tuning frequencies in various applications, such as radios, televisions, and musical instruments. It functions by adjusting the frequency of incoming signals to match a desired station or pitch. In the context of electronics and computers, tuners often involve software-based solutions that allow users to fine-tune settings for optimal performance or connectivity. Computer peripherals, such as sound cards and external audio interfaces, may also incorporate tuners for adjusting sound frequencies and improving audio quality. Sound boards and mixing consoles used in professional audio applications may also include built-in tuners for precise frequency control. Overall, a tuner is an essential tool for achieving accurate frequency alignment and enhancing the performance of electronic devices and musical instruments.