A breadcrumb trail is necessary for websites with a complicated structure or with a wide variety of pages and categories. These usually include shopping websites (including e-commerce), knowledge bases, news agencies, massive blogs, and publishing houses, so their popularity within WordPress websites is understandable. You may use breadcrumbs for almost any website, except those who have no logical hierarchy or grouping (single-level websites, landing pages, etc.).
Where to Use Breadcrumbs:
