The duality of matter implies that matter has both wave and particle properties. In physics, duality refers to the idea that matter can exhibit characteristics of both waves and particles. This concept is best illustrated by the famous double-slit experiment, which showed that particles, such as electrons, can exhibit wave-like behavior, such as diffraction and interference. Conversely, waves, such as light, can exhibit particle-like behavior, such as the photoelectric effect. The duality of matter is an important concept in quantum mechanics and helps explain the behavior of matter on both a microscopic and macroscopic scale.