This lecture covers classical transport in plasmas, focusing on random walks and diffusion processes in both un-magnetized and magnetized plasmas. The instructor explains the proof of diffusive transport, ambipolar diffusion, and classical diffusion of particles and heat. The lecture also delves into the derivation of the diffusion coefficient and the meaning of D in different plasma scenarios. Various equations and simulations are used to illustrate the concepts, including the impact of characteristic frequencies and collision frequencies on transport phenomena. The discussion extends to the generation of ambipolar electric fields and the implications for particle and heat diffusion in plasma.