Audio frequency refers to the range of sound waves that can be heard by the human ear, typically between 20 Hz and 20,000 Hz (20 kHz). Frequencies below 20 Hz are considered infrasound, while those above 20 kHz are classified as ultrasound. This range is crucial for various applications, including music, communication, and sound engineering. In audio technology, different frequencies correspond to different pitches of sound. For example, a low frequency (like 60 Hz) produces a deep bass sound, while a high frequency (like 5,000 Hz) creates a sharp treble sound. Understanding audio frequency is essential for fields such as music production, acoustics, and audio engineering.