Blog Post Tags
Blog post tags are not part of HTML; organize blog posts in your content management system (CMS).
Categories provide a similar way to manage blog entries based on the CMS. Typically, you want to break your posts down into some general categories and then choose more flexible or more specific link tags. For example, if you blog about clothes, you can set shirts and pants as categories. You can then use tags for blue or brown items, regardless of their parent category.
While each CMS handles tags and output categories differently, it’s always a good idea to organize your content carefully. If you take the time to logically link tags and categories, search engines are more likely to create the same semantic links.