The document discusses microformats and schema.org for marking up data on web pages. Microformats are simple, open data standards that use existing HTML elements and classes to semantically mark up information. Schema.org provides a shared vocabulary for structured data marking up people, organizations, events, reviews, products and more using JSON-LD, RDFa, or Microdata. Both aim to help search engines understand pages better but schema.org is controlled by major companies while microformats are more open and lightweight.