Mega menus allow users to see more links all at once without the hassle of scrolling, hovering, and remembering the contents of your menu. A good way to think about Mega Menus is that they are drop down menus within drop down menus. So instead of your normal dropdown menu which shows a submenu when hovering over your main parent links in your navigation bar, a megamenu allows you to have additional parent links and submenus within the dropdown menu.
View full documentation:
https://www.elegantthemes.com/documentation/divi/mega-menus/
