Automatic Background Refetching

Explain how to set up automatic background refetching with React Query to keep data fresh without manual reloads or fetches.
import { useQuery } from 'react-query';
import axios from 'axios';
Import necessary libraries: React Query for data fetching and state management, axios for making HTTP requests.
const fetchPosts = async () => {
  const { data } = await axios.get('');
  return data;
Define an async function to fetch posts from a sample API.
const usePosts = () => useQuery('posts', fetchPosts, {
  refetchInterval: 5000 // Refetch the data every 5000ms (5 seconds)
Use the useQuery hook to fetch posts. The 'posts' key is used to uniquely identify the query. Automatic background refetching is set up by specifying the refetchInterval option.