It's a simple indicator that execute GARCH(1,1) function, it can be used with basis stocks and options, when garch is bellow implied volatility probably implied volatility tend to goes down, and when garch is higher than implied volatility probably implied volatility goes up. Can be used with options trading when buying / selling volatility, for example, buy ATM put and call when garch is higher than implied volatility and sell when it's lower.