The Drude model is a classical physics model used to describe the behavior of electrons in a metal within the framework of classical physics. Proposed by Paul Drude in the early 20th century, this model aimed to explain electrical and thermal conductivity in metals based on classical mechanics. In the Drude model, electrons within a metal are considered as a classical gas. They move freely in the metal lattice and collide frequently with other electrons and lattice ions. These collisions are assumed to be instantaneous and random, leading to a net average velocity of zero. However, in the presence of an external electric field, electrons experience acceleration between collisions, contributing to a net drift velocity, hence producing electrical current.