Intermediate frequencies refer to the frequencies that come in between the higher and lower frequencies in a given range. There are several synonyms for the term, including middle frequencies, medium frequencies, and mid-band frequencies. Another common phrase used to describe these frequencies is "midrange frequencies." In radio technology, intermediate frequencies are often referred to as IF frequencies. These are typically used in bandpass filters that separate the desired frequency from the unwanted ones. For audio signals, the term "audio band" is often used to describe the range of intermediate frequencies. No matter what terminology is used, intermediate frequencies are essential for various fields, including electronics, telecommunications, and audio engineering.