As AI moves from the digital world into the physical world, perception is becoming a key bridge between models and real environments. This talk explains how millimeter-wave radar is evolving from a sensor for ranging, velocity measurement, and object detection into an intelligent perception platform that combines sensing and computing. It explores the opening of radar data from object-level outputs and point clouds to raw ADC data, and examines the potential of Radar × AI in robotics, embodied intelligence, and Physical AI.