A bandpass filter is an electronic device that allows signals within a specific frequency range to pass through while blocking signals outside that range. It is commonly used in various applications, such as audio processing, radio communications, and signal processing, to isolate desired frequencies from unwanted noise or interference. The filter is characterized by its two cutoff frequencies: the lower cutoff frequency and the upper cutoff frequency. Signals that fall between these two frequencies are transmitted, while those outside are attenuated. This makes bandpass filters essential in systems like radio transmitters and receivers, where clear signal transmission is crucial.