Geomessaging is a technology that allows a person or system to send a message based on any media to a device that enters or exits one or more regions.
The content of the message associated to those rules can be any images, text, html, metadata key-value pair, etc.
Platforms that enable geo-notifications to a defined geo-fence would fall into the category of Geomessage Media.
A geo-fence is a virtual radius or polygon defined by longitude and latitude coordinates on a map.
[4] Other use cases include sending messages to a geolocation where members of a known group may enter.