
What geofencing advertising actually is, without the buzzwords
Geofencing advertising means drawing a virtual boundary around a real, physical place and serving mobile ads to the devices that enter it. Not a ZIP code. Not a five-mile radius. An actual polygon traced around a competitor's parking lot, a trade show floor, a hospital campus, a stadium, a apartment complex, or a stretch of Camelback Road.
The mechanism is programmatic display and video delivered through mobile ad exchanges. When a device inside your fence loads an app or a mobile website with ad inventory, your ad is eligible to serve. Because the targeting signal is physical presence rather than a stated interest, you reach people based on what they actually do, which is far more reliable than what a profile says they like.
The part most vendors gloss over is what happens after someone leaves the fence. Almost nobody sees an ad in a competitor's parking lot and immediately drives to you. The value is in the follow — once a device has been captured inside your geofence, you can continue advertising to it for weeks afterward. That retargeting window is where geofencing produces conversions, and it is why campaigns judged on day-three clicks always look like failures.







