LUFS is an acronym for "Loudness Units relative to Full Scale." It is a unit of measurement used to describe the loudness of audio signals.The term was introduced by the European Broadcasting Union (EBU) in order to provide a consistent way of measuring and comparing the loudness of audio signals. The full scale of the measure is determined by the maximum level of the digital audio signal, and the loudness is expressed as a negative value in dBFS (decibels relative to full scale).For example, a loudness level of -23 LUFS would indicate that the audio signal is 23 dB below the maximum level of the digital audio signal.