Free Schema Generation Plugin For WordPress: Schema Creator

Schema data is a set of structured HTML tags that provide a consistent format for search engines to see what type of data is being displayed, so that they can accurately represent that data in search results. When search engines know what content is supposed to represent what on a webpage, it allows them to utilize that in interesting ways.

Schema Creator provides an easy to use form to embed properly constructed schema.org microdata into a WordPress post or page.