Explore the intricacies of holographic renormalization and holographic RG flow in this comprehensive lecture from the Introductory Minicourse on AdS-CFT. Delivered by Horatiu Nastase from IFT-UNESP, Brazil, at ICTP-SAIFR, this nearly two-hour talk delves into advanced concepts in the field of holography and its applications in theoretical physics. Gain insights into the relationship between Anti-de Sitter space and Conformal Field Theory, and understand how renormalization techniques are applied in a holographic context. Discover the principles behind holographic RG flow and its significance in understanding quantum field theories. Suitable for graduate students and researchers in theoretical physics, this lecture offers a deep dive into cutting-edge topics at the intersection of string theory, quantum field theory, and gravitation.