Thingpedia is an encyclopedia of applications for the Internet of Things. Just like how Wikipedia stores knowledge about the world, Thingpedia stores knowledge about devices in the world. Wikipedia is organized around articles; Thingpedia is organized around devices, such as Twitter, a light bulb, or a thermostat.
Each device has a entry on Thingpedia. A Thingpedia entry stores the natural language interface that represent how humans refer to and interact with the device, and the executable specification corresponding to the device API.