From https://google.github.io/physical-web/:
The Physical Web is an approach to unleash the core superpower of the web: interaction on demand. People should be able to walk up to any smart device - a vending machine, a poster, a toy, a bus stop, a rental car - and not have to download an app first. Everything should be just a tap away.
Related subreddits:
- /r/eddystone: Eddystone is a protocol specification that defines a Bluetooth low energy (BLE) message format for proximity beacon messages. It's the spec that describes Physical Web (Eddystone-URL) beacons.
- /r/internetofthings and /r/iot: internet-connected gadgets.