Picture an IoT without batteries. Light-powered energy harvesting paired with ultra-low-power radios enables devices that power themselves. Self-powered sensors and dense, always-available wireless networks are redefining connectivity across logistics, healthcare, industry, and smart cities. The benefits are tangible: near-zero maintenance, lower total cost of ownership, less e-waste, and deployment at massive scale without wiring or battery service. This “invisible mesh” unlocks cold-chain tracking, asset intelligence, condition monitoring, infrastructure telemetry, and interactive retail. It also opens new engineering frontiers: tight energy budgets, intermittent computing, energy-aware security, and frictionless provisioning for fleets of nodes. As Ambient IoT matures, we move toward a world where objects communicate wirelessly—autonomous, sustainable, and battery-free.