The Stochastic Oscillator (STO) is a classic momentum indicator that reflects the relative position of the closing price within a specific period. There are mainly two forms: Fast Stochastic and Slow Stochastic, which correspond to more sensitive and more stable signals, respectively. Its applications include identifying overbought and oversold areas, cross-judging trends, observing momentum strength, and capturing divergence signals, helping traders grasp market reversals.