Structured Data is a group term used to describe the various types of languages specifically created to help search engines understand web pages better—Microdata is just one of a few.
- Structured Data Testing Tool by Google
- Schema.org – embed structured data to web pages for use by search engines.
- Rich snippets “Apple Pie” example
- Schema Creator – generate and manually add Microdata to your site
- Schema Creator for WordPress – dynamically add Microdata to your website
Note: There’s no guarantee that Google will display a rich snippet for your search result, and the rich snippet validator can be buggy at times.