The LUFS [loudness units relative to full scale] meters are extremely accurate at displaying the perceived loudness of audio material. The LUFS scale (sometimes called LKFS, though they're exactly the same thing) was introduced primarily to outline broadcast standards to keep the perceived volume of the different shows and adverts the same. This is called loudness normalisation and it stops the consumer from constantly reaching for the remote to control the volume.
The music industry is following suit, and now many leading streaming platforms such as Spotify, Youtube and Apple Music are normalising music so the play back is at a consistent volume. If you hear a dynamically mastered jazz track followed by a compressed, loud dubstep track on Spotify they maintain a relatively constant perceived loudness.
If you produce music, the following podcast is crucial for you to know, as you need to understand how your audience will experience your music. The current trend of mastering music super LOUD is already extremely detrimental to the quality of the audio…But, as I will explain in this podcast, the future of music consumption will favor dynamic music over loud compressed music. So understanding and using LUFS meters in your production process will ensure your music is heard in its best possible form.