# Ripple | Sync
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Synchronises resources between server and client whenever they change. When a resource changes, the update is streamed to the server or other connected clients. You can specify transformation functions on incoming and outgoing updates to control the flow of data on a per resource, per resource type, or global level. See the [Primer#Sync](https://github.com/rijs/docs/blob/master/primer.md#5-sync) for more info.