The full form of kHz is kilohertz.
Kilohertz (kHz) is a unit of frequency equal to one thousand hertz (1,000 Hz). It's commonly used to measure the frequencies of radio waves, audio signals, and other electromagnetic radiation. For example, you might see kHz listed on a radio to indicate the frequency of a particular AM radio station. A radio receiver can detect sound frequencies up to 300 kHz.
In summary, kHz is a shorthand way of expressing a measurement of frequency in thousands of hertz.
