Explanation: Fast MA & Slow MA: The script uses two simple moving averages (SMA) with adjustable lengths (9 and 21 by default). Trend Detection: The upTrend is when the fast moving average is above the slow moving average, and the downTrend is when the fast moving average is below the slow moving average. Arrows: Green arrows are plotted when the market is in an uptrend, and red arrows are plotted when it's in a downtrend. Bar Color: The bars will be colored green for uptrends and red for downtrends to visually highlight the trend.