Importance of breadcrumbs

[cwvps]

For search engines, breadcrumbs provide a quick navigation guide on where to go after done crawling one page. Other links may exist within the page such as navigation menu or footer links. But from the standpoint of the current page being crawled, breadcrumb navigation offers the best structured way of crawling pages from top to bottom content organization without leaving any page unattended.

[TomClarke]

Google has endorsed use of breadcrumbs  in several of their videos. They are a helpful device for website with complex structure or hierarchy such as e-commerce sites. They not only aid user navigation  but also help search engines get a clearer picture about  your site's structure. For example, if you're using faceted navigation  you could end up on a product page that has a long URL and ambiguous placement in the site's hierarchy. Breadcrumbs can aid with this. Another neat thing is in the SERPs when you get little: Top level - Main Category - Sub Category links under your snippet.

[ajaymehta588]

No, it won't help in improving ranking. But It is helpful for website with complex structure or hierarchy such as eCommerce sites. Also, it is not only aid user navigation but also help search engines get a clearer picture about your site's structure.

[mylofu]

Breadcrumbs search navigation help user as well as search engine to crawl pages. It is must for eCommerce website where several categories and tons of products, breadcrumbs navigation minimize the complexity of structure and improve user engagement.