Sync Gateway is the synchronization server in a Couchbase for Mobile and Edge deployment. It is designed to provide data synchronization for large-scale interactive web, mobile, and IoT applications — see: Figure 1.
You can read more about the Data Synchronization process in Mobile-Server Replication. Amongst its most important and commonly used features is secure Access Control.
Sync Gateway assures secure access control using:
Data Routing, which ensures that authorized users can only access documents in those Sync Gateway Channels assigned to them and only in accordance with their assigned privileges. You can set those privileges to confer Read Access and-or Write Access as required.
The business logic behind the validation and authorization of document access is provided by the customizable Use Sync functions?.