Similar to microdata.

Designed for humans first and machines second, microformats are a set of simple, open data formats built upon existing and widely adopted standards. Instead of throwing away what works today, microformats intend to solve simpler problems first by adapting to current behaviors and usage patterns. - https://microformats.org/wiki/about

What is the difference between microformats and microdata? It seems that microdata is an extension of microformats. Also microdata is meant for HTML5, whereas microformats is meant for everything.