The document presents an overview of beacons in marketing, discussing their functionality, types (iBeacon vs. Eddystone), and case studies showcasing their applications in various industries. Beacons, considered 'lighthouses' of the 21st century, facilitate hyperlocal marketing by delivering personalized messages in real-time, with millions expected to be in use by 2021. The document also provides insights on getting started with beacons, designing campaigns, and available resources.