Wave-particle duality is a fundamental concept in quantum mechanics that describes the dual nature of particles as both waves and particles. This concept proposes that particles, such as electrons and photons, exhibit both wave-like and particle-like properties. The wave nature of particles is observed in phenomena such as interference and diffraction, while the particle nature is evident in phenomena such as the photoelectric effect. Wave-particle duality challenges the classical Newtonian physics view of particles as solid objects with defined trajectories, and instead suggests that particles exist in a state of superposition as both waves and particles at the same time. This concept has profound implications for our understanding of the nature of matter and the behavior of particles at the quantum level.