Adding BreadcrumbList structured data to your ecommerce website helps Google understand the hierarchical structure of your pages. This markup clarifies the relationship between categories and subcategories, enabling Google to display a meaningful breadcrumb trail in search results. Such breadcrumbs improve user navigation and can increase click-through rates by showing users exactly where they are within your site’s structure. Ensure your breadcrumb markup accurately reflects your site’s navigation path and follows Google's documentation to avoid errors. [Google]