The shortcode is a powerful tool for anyone interested in modifying the way their WordPress site works, since shortcodes offer the ultimate customization without forcing you to know much about coding in general.
Shortcodes are essentially short words or phrases that are placed in brackets [like-this]. You can place a WordPress shortcode into the editor, which then references additional information in your functions.php file to reveal something on the frontend of your website.
For example, if you want to embed a video file for a blog post, simply place brackets [ ] around the word video to reference a video that was previously uploaded on your site. Shortcodes are great for creating things like buttons, accordion style sliders, Twitter widgets, dividers, and all sorts of formatting goodies that would typically force you to understand PHP coding.