Molecular dynamics is a computational technique used in the field of chemistry and physics to study the movement and interactions of atoms and molecules over time. It involves simulating the behavior of a system of particles based on their physical properties and interactions. By tracking the positions and velocities of individual particles, researchers can gain insights into the structure, dynamics, and properties of complex systems at the atomic level. Molecular dynamics simulations are used to study a wide range of phenomena, including chemical reactions, protein folding, and material properties.