Decibel
A loudness scale where every 10 steps up means ten times the sound power.
See it in Audio visualizer. Press Microphone and raise Response to see quieter sounds.
In plain words
Ears handle a huge range, from a pin drop to a jet engine. Counting that range in plain numbers would need enormous figures. Decibels squeeze it: every 10 decibels up means ten times more sound power. A whisper is about 30, talking about 60 and a loud concert about 110. Long exposure above about 85 can harm hearing.