Outcome, it's behaving like a baseline filter and it can be use as an exit or a trailing stop indicator.
As comparing to Kijun-sen line in yellow, the QQE trailing line follows the price closer, therefore exiting you sooner when the trend direction changes.
There's 2 QQE option, they behave differently during the trend change.
Credits to Glaz and Shizaru for their QQE code.
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.