Options Greeks Explained: Delta, Gamma, Theta, Vega for Beginners Options Greeks are the set of risk metrics that describe how an option’s price responds to the forces acting on it: stock price movement, time, volatility, and interest rates. Understanding them is not optional for serious options trading. Every experienced trader thinks in Greeks, because the Greeks tell you exactly what will happen to your position before the market moves. Ignore them and you are flying blind on every trade. ...