This indicator is showing level's density prices on background's graph.
Theses levels are showing the prices that are the most traded by the market.
This means that these levels can be used in order to place stoploss or takeprofit for swing orders, or for scalping manually in short time periods.
This gives a statistical advantage as these levels are more likelely to be reached or pullbacked by the market.
It is also usefull on VIX for example to determine when to enter local low volatility.