This lecture covers the concept of viscous flow in compressible Newtonian fluids, emphasizing the impact of viscosity and no-slip boundary conditions. It delves into the equations governing laminar shear flow between two parallel plates, highlighting the challenges in solving nonlinear differential equations. The presentation explores the behavior of fluid molecules near walls and the implications for lift generation. Additionally, it discusses the complexities of viscous terms and the interplay between normal and tangential components in fluid dynamics.