Description: A subscription resolver is a function that handles subscription events in GraphQL. Unlike queries and mutations, which are one-time operations, subscriptions allow clients to receive real-time updates about certain events. This is particularly useful in applications where information changes frequently, such as online chats, notifications of database changes, or status updates in various types of applications. Subscription resolvers are responsible for establishing and maintaining persistent connections between the client and server, using protocols like WebSocket to send data to clients when specific events occur. This ability to receive real-time data enhances interactivity and user experience, allowing applications to be more dynamic and responsive. In terms of implementation, a subscription resolver is defined in the GraphQL schema and is associated with a specific event, allowing clients to subscribe to those events and automatically receive updates when relevant changes occur.
