A WordPress shortcode is a simple tool that helps you add features to your website—without needing to know how to code. It’s written in square brackets like this: [shortcode_name].
Instead of writing long blocks of code to add functions to your website you can just use a shortcode. When your page is viewed, WordPress automatically replaces that shortcode with the feature it represents, which is usually implemented by a plugin that contains the necessary code. No technical skills required.