Energy harvesting is known as power harvesting or energy scavenging, or ambient power it is the process by which ambient energy is captured and, if necessary, stored to provide electricity for small autonomous devices, like those used in wearable electronics, condition based monitoring and wireless sensors networks.
Usually the power is stored as electricity.
Batteryless and Wireless can realize less waste. No battery replacement and recharging save labor and cost.
They contribute for sustainable society and improve corporate value.