Explore the intricacies of small x physics in the context of RHIC, ALICE, and ePIC experiments in this informative lecture. Delve into the study of high-energy particle collisions and their implications for understanding the fundamental structure of matter. Learn about the latest research and findings from these cutting-edge facilities, including the Relativistic Heavy Ion Collider (RHIC), A Large Ion Collider Experiment (ALICE), and the future electron-ion collider project (ePIC). Gain insights into the behavior of quarks and gluons at extremely high energies and small momentum fractions, and discover how these experiments contribute to our understanding of quantum chromodynamics and the early universe.