Breadcrumbs are navigation links, used to display all the pages leading from the home page. This is placed at the top of the page and helps to backward navigation. You guys may think what is the purpose of this post as their are tones of plugins that is doing the same job. Well, the answer is simple the more plugins or external resources you use, the more heavy and hard to maintain your website.
Here is the complete tutorial of creating your own custom wordpress breadcrumb.