The link set that allows search engine bots and users to make sense of the hierarchy of a given website. The breadcrumb structure not only conveys the hierarchy of a website but also helps users easily navigate the website. In a nutshell, it is safe to say that the breadcrumb structure acts as a navigator for search engine bots and users. This structure, which is used especially in websites with sophisticated category trees, can help reduce the bounce rate as well as contribute to the user experience.
