The Physical Web is an approach to unleash the core super power of the web: interaction on demand. People should be able to walk up to any smart device: e.g. a vending machine, a poster, a toy, a bus stop, a rental car, and not have to download an app first in order to use it. The user experience of using smart devices should be much like we use links on web, just tap and use.
The Physical Web is, at its base, a discovery service where URLs are broadcast and any nearby device can receive them. This takes the web we know and love and unlocks exciting new ways to interact.
URLs for everything! Discovery is done using Bluetooth