Description: A subscription event is an occurrence that triggers a notification to subscribed clients. In the context of GraphQL, this concept refers to the ability of clients to receive real-time updates about changes in the data they are interested in. Unlike traditional queries, where the client requests data and waits for a response, subscriptions allow the server to automatically send data to the client when certain events occur. This is particularly useful in applications where information changes frequently, such as collaborative tools, live data monitoring, or any environment requiring immediate updates. Subscriptions in GraphQL are implemented through protocols like WebSockets, enabling efficient bidirectional communication. Clients can subscribe to specific events and receive instant updates, thereby enhancing the user experience by keeping information current without needing to reload the page or make repeated queries. This approach not only optimizes application performance but also reduces server load, as data is only sent when relevant changes occur. In summary, subscription events in GraphQL are a powerful tool for building interactive, real-time applications, facilitating more dynamic communication between client and server.
