Explore a comprehensive lecture on the particles at null-infinity, delivered by Shamik Banerjee at the International Centre for Theoretical Sciences. Delve into the intricacies of AdS/CFT correspondence and its impact on string theory and quantum gravity over the past two decades. Examine key concepts such as the Asymptotic Poincare Group, space-time translation, transition amplitudes, and creation and annihilation fields. Gain insights into the applications of these theories and the U(1) Kac-Moody algebra. This talk, part of a broader discussion on "AdS/CFT at 20 and Beyond," offers a deep dive into the revolutionary discoveries in theoretical physics and their far-reaching connections to other areas of study.