is a and it should be used to indicate the direction of the market.
It can be used as confirmation of a buy signal when the market is showing higher high and higher lows and after a red colored candle there is a green candle.
As well it can be used as confirmation of a sell signal when the market is showing lower high and lower lows and after a green colored candle there is a red candle.
or it can be used as exit indicator when on uptrend after the green candles there is a red candle or on the downtrend after red candles there is a green candle.
In true TradingView spirit, the author of this script has published it open-source, so traders can understand and verify it. Cheers to the author! You may use it for free, but reuse of this code in a publication is governed by House Rules. You can favorite it to use it on a chart.