What does "synchronization" mean in Xiaomi's mobile phone settings?

The synchronization function of Xiaomi mobile phone is millet cloud service. The setting method is as follows:

Tool/Material: Xiaomi 6

1. First, find the settings in your mobile phone and enter the settings page.

2. After entering, find the synchronization option and click Enter.

3. After starting synchronization, find the millet cloud service option and click Enter.

4. Then click Start Automatic Synchronization, so that the information, photos, contacts and other materials on the mobile phone can be synchronized to the cloud service.

5. As shown in the figure below, at this time, the mobile phone is synchronizing the data to the cloud service, just waiting for the system to upload it automatically.