AWS AppSync is a fully managed service that enables developers to build digital experiences based on real-time data. With AppSync, you can configure data sources to push and publish real-time data updates to subscribed clients. AppSync handles connection management, scalability, fan-out and broadcasting, allowing you to focus on your application business needs instead of managing complex infrastructure. With AppSync, developers can easily specify filtering roles for their subscriptions to target specific connected clients based on the published data.
Source:: Amazon AWS