The Breadcrumb navigation portlet shows the location of the current page in context of the site. This form of navigation helps the user visualize the structure of the site and quickly move from a page that is very specific to a broader grouping of information. The Breadcrumb navigation for this documentation page looks like this:

Simply add the Breadcrumb portlet to each page you want it on. The portlet will determine its place in the structure of the website and dynamically build its proper path.