A subpage is not immediately visible on the main menu bar. Subpages are featured in drop-down menus, a menu that appears when a visitor hovers over a landing page in the main menu.

Any page can be a subpage and subpages can have their own subpages. 

Why Have Subpages?

Subpages offer better organization and navigation of the website. They are especially useful in sites that are content-heavy or when a client has multiple categories of disparate services or products. 

For example, subpages can be used to showcase products from different brands 

Subpages can also be used to divide up different services offered. Each one can describe the details and benefits of a particular service offered. 

Subpages can also show off different galleries or project portfolios. .