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+---
+title: What is the difference between synchronous and asynchronous code in JavaScript?
+type: question
+tags: javascript,function,promise
+authors: chalarangelo
+cover: blog_images/pineapple-on-green.jpg
+excerpt: Understanding the differences between synchronous and asynchronous code is a crucial piece of knowledge for every web developer.
+firstSeen: 2021-11-14T05:00:00-04:00
+---
+
+Synchronous code runs in sequence. This means that each operation must wait for the previous one to complete before executing.
+
+```js
+console.log('One');
+console.log('Two');
+console.log('Three');
+// LOGS: 'One', 'Two', 'Three'
+```
+
+Asynchronous code runs in parallel. This means that an operation can occur while another one is still being processed.
+
+```js
+console.log('One');
+setTimeout(() => console.log('Two'), 100);
+console.log('Three');
+// LOGS: 'One', 'Three', 'Two'
+```
+
+Asynchronous code execution is often preferable in situations where execution can be blocked indefinitely. Some examples of this are network requests, long-running calculations, file system operations etc. Using asynchronous code in the browser ensures the page remains responsive and the user experience is mostly unaffected.