What are iBeacons? And how can they be used at events?
Put simply, iBeacons can tell when your phone is in close proximity and react by sending a message to it (or performing another pre-determined action).
‘iBeacon’ is actually Apple’s brand name for a new type of generic technology known as an ‘indoor proximity system’ which uses the latest version of Bluetooth (Bluetooth Low Energy – BLE) to enable smart phones or similar devices to receive messages or perform actions when in close proximity of an anchor device (an iBeacon).
More information: http://www.noodlelive.com/blog/what-are-ibeacons-and-how-can-they-be-used-at-events/