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1# Distributed Demo
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3### Introduction
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5This sample shows how to build distributed abilities and services. In this sample, you can:
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71. Obtain a device through the API provided by the distributed hardware.
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92. Start an ability on a remote device.
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113. Bind a service on a remote device.
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13The display effect is as follows:
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15![](screenshots/device/main.png)
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17### Concepts
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19Distributed data service (DDS): The DDS implements distributed database collaboration across devices for applications. Applications save data to distributed databases by calling the DDS APIs. The DDS isolates data of different applications based on a triplet of account, application, and database to ensure secure data access. The DDS synchronizes application data between trusted devices to provide users with consistent data access experience on different devices.
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21### Required Permissions
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23ohos.permission.DISTRIBUTED_DATASYNC, which allows an application to exchange data with other devices.
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25### Usage
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271. Connect two devices to the network.
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292. Grant the permissions in the displayed dialog box.
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313. On the home page of the sample app on one device, touch **RegisterDeviceListCallback** to register the device. After the registration is successful, touch **AuthDevice** to authenticate the device. Enter the corresponding PIN on the other device.
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334. After the connection is successful, check that you can invoke the local ability, remote ability, local service, and remote service.
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355. When you perform operations on either device, the data displayed on both devices is the same.
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37### Constraints
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391. This sample can run only on standard-system devices, and API version 8 or later are supported.
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412. DevEco Studio 3.0 Beta4 (Build version: 3.0.0.992, built on July 14, 2022) must be used.
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433. This sample uses the system interface **@ohos.distributedHardware.deviceManager**. To use the Full SDK, you must manually obtain it from the mirror and switch to it in DevEco Studio. For details, see [Guide to Switching to Full SDK](https://gitee.com/openharmony/docs/blob/master/en/application-dev/quick-start/full-sdk-switch-guide.md).
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