Classical chaos refers to a phenomenon in dynamical systems where small changes in initial conditions can lead to vastly different outcomes. This sensitivity makes long-term predictions difficult, even though the underlying equations governing the system are deterministic. Examples of classical chaotic systems include the double pendulum and Lorenz attractor. In classical mechanics, chaos can arise in systems with non-linear interactions, where the behavior becomes unpredictable over time. Despite this unpredictability, chaotic systems often exhibit patterns and structures, such as strange attractors, which help to understand their behavior.