Step 1: Imagine a Weather Guesser Picture two towns. In Town A , the weather is almost always the same: sunny, 75 degrees, every single day. Nobody worries about the forecast because tomorrow will probably look just like today. In Town B , the weather goes wild. One day it's sunny, the next it's a thunderstorm, then it snows, then it's sunny again. Nobody really knows what's coming. If you had to guess how big tomorrow's weather swing might be in each town, you'd guess a small swing for Town A and a big swing for Town B. Implied volatility (IV) is that same kind of guess — but for a stock's price, not the weather. Step 2: Stocks Have "Calm" Days and "Wild" Days Too Look at the picture you shared. It's a table of stocks, and one whole section is labeled "Volatility." Some stocks are like Town A — calm and boring: EWC (iShares MSCI Canada ETF) has a Current IV30 of just 12.8 . That's a low number, meaning ...