An LC filter is an electronic circuit that uses an inductor (L) and a capacitor (C) to filter signals. It can be designed to allow certain frequencies to pass while blocking others, making it useful in various applications like audio processing and radio communications. The combination of the inductor and capacitor creates a resonant circuit that can either act as a low-pass or high-pass filter, depending on how it is configured. These filters are essential in reducing noise and improving signal quality in electronic devices. By selectively allowing or rejecting frequencies, LC filters help maintain the integrity of signals in systems such as televisions, radios, and computers. Their effectiveness and simplicity make them a popular choice in many electronic designs.