A good site should communicate to the users where they are on your site, at all times. A typical way to telling users where they are is to leave a breadcrumb trail on all your pages.
To build a bootstrap navigation bar, you use an unordered list, <ul>. For a bootstrap breadcrumb trail, you will us an ordered list, <ol>. This makes sense. Order is not so important for the navbar, but it is important for the breadcrumb trail. You want users to know where they are, and how to get back to where they came from.
For example, directly under the main heading, <h1>, on a page called “Albums”, you would create a breadcrumb trail as follows:
<!– end breadcrumb –>
Using the bootstrap class “breadcrumb”, the trail on your albums page should display as pictured.
You would then add <li> elements to your breadcrumb trail depending on how many levels deep you go into your website. For example if someone clicks on one of your albums, then it would take that user to the photos page. Therefore, you would add a third <li> element to the breadcrumb on the photos page.