Volatility SDE

Definition

A Volatility Stochastic Differential Equation (SDE) models the dynamic evolution of an asset’s volatility over time, incorporating random fluctuations. Unlike constant volatility assumptions, these models capture the observed phenomenon of stochastic volatility, where volatility itself is a random process. The Heston model is a prominent example, describing equity price volatility with its own SDE. Understanding this dynamic is crucial for accurate derivatives pricing.