WooCommerce breadcrumbs are the first thing you see on the WooCommerce pages (except cart/checkout, they are default WP pages). They are a list, path or levels of categories.
By default the breadcrumbs are enabled.
To setup the colors, alignment or disable this function go to Customizer – WooCommerce – Breadcrumbs
Note: To enable breadcrumbs for default WP pages, follow this tutorial