# Proper Noun in ThingsBoard

:::info
Aim: Definition and explanation of proper nouns
:::

## Tenants and Customers

### Tenants
* A separate business-entity: it’s an individual or an organization who **owns** or produce devices and assets; Tenant may have multiple tenant administrator users and millions of customers, devices and assets

### Customers
* Also a separate business-entity: individual or organization who **purchase or uses** tenant devices and/or assets; Customer may have multiple users and millions of devices and/or assets

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## Attribute and Telemetry

### Attribute

#### Client Attributes
Client attributes is to report device state.
The value of the client-side attribute is read-only for the UI/REST API.

#### Server Attributes
Server attributes is supported by almost any platform entity.
The device firmware can't access the server-side attribute.

#### Shared Attributes
Shared attributes is to store device settings.

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### Telemetry
Information related to time-series data from devices

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## Devices & Assets

### Device
Basic IoT entities that may produce telemetry data and handle RPC commands. For example, sensors, actuators, switches

### Asset
Abstract IoT entities that may be related to other devices and assets. For example factory, field, vehicle

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## Widgets
IoT Dashboards are constructed using ThingsBoard widgets defined in the Widget Library. Each widget provides end-user functionality such as data visualization, remote device control, alarm management and so on.

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## Rule Engine
A user-friendly framework for building event-driven workflows.
[Rule Engine Overview](https://hackmd.io/1YiF_y_nTCyiqgLtkLAnXA)
Potential events

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## Reference

[Thingsboard Doc](https://thingsboard.io/docs/user-guide/entities-and-relations/)