Understanding Asynchronous Programming in JavaScript

JavaScript is single-threaded, which means it can only do one thing at a time. Asynchronous programming lets you run tasks in the background without blocking the main thread.

• Callbacks
• Promises
• Async/Await

async function fetchData() {
  const res = await fetch('/api/data');
  const json = await res.json();
  console.log(json);
}

Understanding async code helps you write non-blocking apps and improves performance when working with APIs or databases.