A "subpage" in web design refers to an additional page that is linked to the main page of a website. It usually contains more specific information or more detailed content on a particular topic that is addressed on the main page.
For example, let's imagine a website for a fashion shop. The home page could give a general overview of the shop and the products on offer. On the homepage, there could be a menu item such as "Women's clothing". When a visitor clicks on this menu item, they are redirected to a subpage that specifically presents women's clothing. Here the visitor will find detailed information on the available garments, sizes, colours etc.
The subpage is often used to structure content and provide visitors to a website with better navigation and targeted information. By linking the main page and subpage, users can easily switch back and forth between different content by clicking on corresponding menu items or internal links.
It is important that the design and usability of a subpage is consistent with the overall design of the website to ensure a seamless experience for visitors.