This is a post categorized under a nested category. This means the category is a sub-category of a main category. You won't really notice the difference, except if the permalink structure of your blog is category-dependent, and in that case the URL will look like this: http://yourblog.com/main-category/sub-category/post-slug This is actually how this demo blog's permalink structure is done, so you can look at your address bar for a preview of how nested categories look like. This is … read on »