A subfolder is a part of a website’s structure that helps organise content within the main domain. For example, in “www.example.com/blog/article”, “blog” is the subfolder. They make it easier for users and search engines to find information. Using clear names like “/products/electronics” instead of vague ones can improve SEO by making your site more relevant and user-friendly. Overall, well-structured subfolders help with navigation and boost your site’s visibility online.