Mega menus are common on e-commerce sites because they typically include a lot of categories of different products, and so mega menus can be very useful for visitors. Specially, for sites involving a lot of pages and products, a mega menu is able to improve navigation and usability.
As you may know, Mega menus are a type of drop-down, which seeks to overcome some of the usability drawbacks to traditional style drop-downs. Primarily, mega menus have two advantages:
1. The information architecture of your navigation is made clearer and is visible all at once
2. The amount of clicking, searching, and navigating is reduced
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