Subscriptions enable real-time data updates in GraphQL. It allows clients to subscribe to specific events and receive corresponding updates whenever those events occur. This is particularly useful for applications that require real-time data, such as chat applications or live sports scoreboards. Subscriptions are defined as a special type in the GraphQL schema and clients can subscribe to events using the subscribe
operation. Here's an example of a subscription query:
subscription {
newMessage(userId: "123"){
id
content
createdAt
}
}