Dive into the fascinating world of active matter with this comprehensive lecture on the Physics of Flocking. Delivered by Francesco Ginelli from the University of Insubria, Italy, as part of the School on Active Matter at ICTP-SAIFR, this 1 hour and 49 minute session serves as the first class in a series exploring the collective behavior of self-propelled particles. Gain insights into the fundamental principles governing flocking phenomena, from bird formations to fish schools and even human crowds. Explore theoretical models, mathematical frameworks, and real-world applications of this emerging field at the intersection of physics and biology. Ideal for graduate students, researchers, and anyone interested in complex systems and collective dynamics.