Web Storage (localStorage, sessionStorage, cookies)

What is the purpose of the 'storage' event demonstrated in this code?
window.addEventListener('storage', (e) => {
  console.log('Key changed:', e.key);
  console.log('Old value:', e.oldValue);
  console.log('New value:', e.newValue);
  console.log('Storage area:', e.storageArea);
  console.log('URL:', e.url);
});
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