Domain structure is how a website’s URLs are organized and connected, showing how different pages relate to each other. It usually includes the main domain, optional subdomains, folders, and individual pages. For example, "www.example.com/products/shoes" shows that "shoes" is part of the "products" section.
A good domain structure makes websites easier to navigate and understand, both for users and search engines. It helps people find what they’re looking for quickly and makes search engines better at indexing and ranking your content, improving your website’s visibility.