# Management data model

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* Green bordered blocks are objects provided to you.
* Green filled blocks are objects you can create and manage.
* Grey bordered blocks are objects globally managed by the system.

## Customer

If you have an account on KPN Things Data Management, it belongs to a [Customer account](https://docs.kpnthings.com/kpn-things/getting-started/tutorials/technical-overview/broken-reference). All main objects in the KPN Things Data Management belong to a Customer: Projects, Devices, Destination and Network subscriptions.

A **Network subscription** contains information for network types for a specific client. [Learn more about connectivity types](https://docs.kpnthings.com/kpn-things/building-blocks/connectivity).

## Project

Each **Project** defines a solution you buy or build in KPN Things. Learn more about [Projects](https://docs.kpnthings.com/kpn-things/getting-started/tutorials/accounts-and-projects/projects).

## Flow

With a **Flow** you link one or more devices to one or more plugs. So, if data is received from a device in a device group, its data will be forwarded to the plugs that are in the same device group.

A project has one or multiple **activated decoders** and **encoders**. These decoders prescribe which decoders should be used when data is received by a device that is in a device group that belongs to this project. Learn more about [Flows](https://docs.kpnthings.com/kpn-things/the-portal-explained/things-manager/processing).

## Device

A **Device** represents a single physical device that can send data to the platform. When creating a device you tell the system the device specification it belongs to.&#x20;

A **Device specification** has one or multiple supported network types. For all our supported device types, go to[ Devices](https://docs.kpnthings.com/kpn-things/getting-started/tutorials/connect-devices/supported-devices-and-kpn-devices).

For a device, you can create a **Network info** for each supported network type of the given device specification.

## Destination

A **Destination** allows you to forward the data from your devices to an external system. For detailed information go to [Destinations](https://docs.kpnthings.com/kpn-things/building-blocks/destinations).