Tags are values used to classify and organize content. In our content management system, editors assign tags to each post. These tags speak to the entities in the story ― things like a person, a place, a country or any broader concept. Once a post is published, the assigned tags are displayed on the front end. Here is an example of tags on our site:
Article source: http://www.huffingtonpost.com/entry/good-taxonomy-seo-strategy_us_5925e15ae4b0265790f49d15