Kilohertz (kHz) is a unit of frequency that measures cycles per second. One kilohertz equals 1,000 cycles per second. It is commonly used in various fields, including telecommunications, audio engineering, and radio broadcasting, to describe the frequency of sound waves and electromagnetic signals. In audio applications, frequencies in the kilohertz range are important for understanding sound quality. For example, human hearing typically ranges from about 20 Hz to 20 kHz, with many musical notes and sounds falling within this spectrum. Devices like speakers and microphones often specify their performance in kilohertz to indicate their frequency response.