GraphQL subscriptions provide a real-time mechanism for syncing client and server communications by allowing users to subscribe to specific events and receive real-time notifications when those events occur. This tutorial offers a detailed guide on implementing GraphQL subscriptions using a Node.js server and JSON data, focusing on operations such as creating, updating, and deleting posts. It utilizes the graphql-yoga module, which simplifies setup and integrates seamlessly with Node.js, facilitating the publisher/subscriber model needed for efficient event-driven systems. The tutorial explains how to establish a GraphQL server, define schemas and resolvers, and use the pubsub.asyncIterator function for managing subscriptions. By following this process, developers can implement real-time notifications for client-server interactions, enhancing the responsiveness and interactivity of applications. Additionally, tools like LogRocket are recommended for monitoring and debugging GraphQL requests to ensure reliable production performance.