This lecture covers the fundamental concepts of catalysis, including the role of catalysts in breaking chemical bonds, molecular orbital theory, formation of electron bands, bonding in metals, and molecular adsorption on d-metals. It also discusses infrared spectroscopy of gas phase and adsorbed molecules, dissociative adsorption of H2, and the kinetics of catalytic reactions. The Langmuir adsorption isotherm and Langmuir-Hinshelwood kinetics are explained, along with the simulation of pressure dependence on reaction rates.