Analog filters are electronic circuits that allow certain frequencies of signals to pass through while blocking others. They are commonly used in audio equipment, radios, and communication systems to enhance sound quality or eliminate unwanted noise. By using components like resistors, capacitors, and inductors, analog filters can be designed to target specific frequency ranges, such as low-pass, high-pass, band-pass, or band-stop filters. These filters work in real-time, processing signals as they are received. For example, a low-pass filter allows low-frequency sounds to pass while reducing higher frequencies, making it ideal for bass-heavy music. Understanding analog filters is essential for anyone working with signal processing or electronic design.