# Terminologies

The following table lists the Fogwing  terminologies that are used across the application:

| Terminology   | Meaning                                                                                 |
| ------------- | --------------------------------------------------------------------------------------- |
| Application   | Virtual name for one or group of edge functions                                         |
| Edge          | Any device or gateway that sends telemetry data to cloud application                    |
| IoThub        | An MQTT hub is the gateway of fogwing to receive high volume messages                   |
| Client Id     | A unique id required to connect with MQTT broker                                        |
| Data log      | A data storage of telemetry data received from edge devices                             |
| Active Edge   | The edge devices that are in contact with Fogwing IoThub less than 3 hours              |
| Inactive Edge | The edge device(s) that were connected earlier and are now silent for more than 3 hours |
| Payload       | the actual payload received from the edge devices through IoThub                        |
| Audit log     | All functional events that happen within Fogwing recorded as log                        |

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This is a living page where we will keep updating the terminologies as and when we introduce.
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