async function getUser(id) {
  try {
    const res = await fetch(`/api/users/${id}`);
    if (!res.ok) throw new Error('Request failed');
    const user = await res.json();
    return user;
  } catch (err) {
    console.error('Failed to load user:', err);
    throw err;
  }
}

• async functions always return a Promise
• await pauses execution until the awaited Promise settles
• await only works inside an async function (or top-level modules)
• Wrap awaits in try/catch to handle rejected promises