WordPress is a great website creation platform and since it is a free, open-source program, it is very popular. So, chances are that you or someone you know is using WordPress to blog or share content. However, whether you are new to this CMS, or have been using it for a while, it is always a bit jarring to see the 'WordPress jQuery is not defined' alert.

Before we delve into a solution for this error, it is important to know what it is, what it does, and why a WordPress 'jQuery is not defined' warning pops up. Below are the answers to some of the most common questions regarding this error, and how to fix it.