Explore the intricacies of elastic and deep inelastic scattering in this comprehensive lecture by V. Ravindran, part of the International School and Workshop on Probing Hadron Structure at the Electron-Ion Collider. Delve into the fundamental concepts crucial for understanding particle interactions at high energies, particularly relevant to the upcoming Electron-Ion Collider (EIC) at Brookhaven National Lab. Gain insights into how these scattering processes contribute to our understanding of proton and neutron structure, quark and gluon distributions, and the mysteries of nuclear matter. Learn about the theoretical frameworks and experimental techniques used to study these phenomena, and how they relate to key questions in particle physics, such as the origin of nucleon mass and spin.