A shortcode is a WordPress-specific code that lets you do nifty things with very little effort. Shortcodes can embed files or create objects that would normally require lots of complicated code, in just one line.
You can use shortcodes for contact forms, images, widgets, etc.
Open the list of components and find the Shortcode component in the list. Use drag-and-drop to add a shortcode in a page you are customizing.
In the Content tab corresponding to the Shortcode component, fill in the blank space with the shortcode needed to insert a file or an object you want into the page.