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React Query is a data fetching library for React that makes it easy to fetch, cache, and update data in your React components. Server-Sent Events (SSE) is a web technology that allows a continuous stream of data to be sent from the server to the client over a single HTTP connection.

React Query can use SSE as one of its data fetching strategies, allowing it to pull in real-time data updates from the server. This is achieved by creating an SSE connection to the server, which will continuously stream updates to the client. React Query will then update the cached data as new information is received in real-time, making it available to the React components.

By using React Query with SSE, it is possible to create real-time applications that are responsive and provide up-to-date data to the user. This can be particularly useful in applications such as stock tickers, sports scores, or real-time chat applications.